Patents by Inventor Tomoyuki Maeda
Tomoyuki Maeda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11462239Abstract: According to one embodiment, a magnetic head includes a shield, a magnetic pole, a first magnetic layer provided between the shield and the magnetic pole, a second magnetic layer provided between the first magnetic layer and the magnetic pole, a third magnetic layer provided between the second magnetic layer and the magnetic pole, a first nonmagnetic layer provided between the shield and the first magnetic layer, a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer, and a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole. The first and third nonmagnetic layers include one of Cu, Ag, Au, Al, and Ti. The second and fourth nonmagnetic layers include one of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru.Type: GrantFiled: August 17, 2021Date of Patent: October 4, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Tazumi Nagasawa, Naoyuki Narita, Hirofumi Suto, Masayuki Takagishi, Tomoyuki Maeda
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Publication number: 20220270640Abstract: According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the second magnetic pole and the first magnetic layer, a third magnetic layer provided between the second magnetic pole and the second magnetic layer, a first non-magnetic layer provided between the first magnetic layer and the first magnetic pole, a second non-magnetic layer provided between the second and first magnetic layers, a third non-magnetic layer provided between the third and second magnetic layers, and a fourth non-magnetic layer provided between the second magnetic pole and the third magnetic layer. A thickness of the first magnetic layer is thicker than a thickness of the second magnetic layer. A thickness of the third magnetic layer is thicker than the second layer thickness.Type: ApplicationFiled: August 9, 2021Publication date: August 25, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yuji NAKAGAWA, Naoyuki NARITA, Masayuki TAKAGISHI, Tomoyuki MAEDA, Tazumi NAGASAWA, Hirofumi SUTO
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Publication number: 20220270641Abstract: According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the second magnetic pole and the first magnetic layer, a third magnetic layer provided between the second magnetic pole and the second magnetic layer, a fourth magnetic layer provided between the second magnetic pole and the third magnetic layer, a first non-magnetic layer provided between the first magnetic layer and the first magnetic pole, a second non-magnetic layer provided between the second and first magnetic layers, a third non-magnetic layer provided between the third and second magnetic layers, a fourth non-magnetic layer provided between the fourth magnetic layer and the third magnetic layer, and a fifth non-magnetic layer provided between the second magnetic pole and the fourth magnetic layer.Type: ApplicationFiled: August 9, 2021Publication date: August 25, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yuji NAKAGAWA, Naoyuki NARITA, Masayuki TAKAGISHI, Tomoyuki MAEDA, Tazumi NAGASAWA, Hirofumi SUTO
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Patent number: 11417355Abstract: According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic pole and the first magnetic layer, a third magnetic layer provided between the first magnetic pole and the second magnetic layer, a first nonmagnetic layer provided between the first magnetic layer and the second magnetic pole, a second nonmagnetic layer provided between the second and first magnetic layers, and a third nonmagnetic layer provided between the third and second magnetic layers. The third magnetic layer includes first and second elements. The first and second magnetic layers do not include the second element. Or concentrations of the second element in the first and second magnetic layers are less than in the third magnetic layer.Type: GrantFiled: February 17, 2021Date of Patent: August 16, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Naoyuki Narita, Masayuki Takagishi, Hitoshi Iwasaki, Tomoyuki Maeda
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Patent number: 11398244Abstract: According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a third magnetic layer provided between the second magnetic layer and the second magnetic pole, a first nonmagnetic layer provided between the first and second magnetic layers, a second nonmagnetic layer provided between the second and third magnetic layers, and a third nonmagnetic layer provided between the first magnetic pole and the first magnetic layer. A first magnetic pole length of the first magnetic pole is less than a second magnetic pole length of the second magnetic pole. A first magnetic layer length of the first magnetic layer is greater than a second magnetic layer length of the second magnetic layer.Type: GrantFiled: February 17, 2021Date of Patent: July 26, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda, Tazumi Nagasawa, Hitoshi Iwasaki, Hirofumi Suto
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Patent number: 11393493Abstract: According to one embodiment, a magnetic recording head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first magnetic pole and the second magnetic pole. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer, a second non-magnetic layer provided between the second magnetic layer and the second magnetic pole, and a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer. The first magnetic layer includes a first element including at least one of Fe, Co, or Ni. The second magnetic layer includes the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc.Type: GrantFiled: August 10, 2021Date of Patent: July 19, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yuji Nakagawa, Naoyuki Narita, Masayuki Takagishi, Tomoyuki Maeda, Tazumi Nagasawa, Hitoshi Iwasaki, Hirofumi Suto
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Publication number: 20220157336Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, a first circuit, a second circuit, a third circuit, and a controller. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a coil. The magnetic element is located between the first magnetic pole and the second magnetic pole. The magnetic element includes a first magnetic layer. The first circuit is configured to supply a coil current to the coil. The second circuit is configured to supply an element current to the magnetic element. The third circuit is configured to detect an electrical resistance of the magnetic element. The controller is configured to control the element current by controlling the second circuit based on the electrical resistance detected by the third circuit.Type: ApplicationFiled: August 4, 2021Publication date: May 19, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi SUTO, Tazumi NAGASAWA, Masayuki TAKAGISHI, Naoyuki NARITA, Tomoyuki MAEDA, Hitoshi IWASAKI
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Publication number: 20220149354Abstract: An active material is provided for use in a solid-state battery. The active material exhibits at least one peak in the range of 0.145 to 0.185 nm and at least one peak in the range of 0.280 to 0.310 nm in a radial distribution function obtained through measurement of an X-ray absorption fine structure thereof. In the particle size distribution, by volume, of the active material obtained through a particle size distribution measurement by laser diffraction scattering method, the ratio of the absolute value of the difference between the mode diameter of the active material and the D10 of the active material (referred to as the “mode diameter” and the “D10” respectively) to the mode diameter in percentage terms, (|mode diameter?D10|/mode diameter)×100, satisfies 0%<((|mode diameter?D10|/mode diameter)×100)?58.0%.Type: ApplicationFiled: February 26, 2020Publication date: May 12, 2022Inventors: Jun OMURA, Daisuke WASHIDA, Tetsuya MITSUMOTO, Hitohiko IDE, Yasuo KOMODA, Yasuhiro SHIBATA, Yasunori TABIRA, Tomoyuki MAEDA
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Publication number: 20220122632Abstract: According to one embodiment, an evaluation method of a magnetic head is disclosed. The method can include acquiring an electrical signal obtained from a magnetic element when supplying a first alternating current to a coil of a magnetic head and supplying a second current to the magnetic element. The magnetic head includes a first magnetic pole, a second magnetic pole, and a coil. The magnetic element is provided between the first magnetic pole and the second magnetic pole, and includes a first magnetic layer. The method can include detecting a time required for a change of an electrical resistance of the magnetic element based on a time when a polarity of the first alternating current is reversed based on the electrical signal.Type: ApplicationFiled: July 30, 2021Publication date: April 21, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Hirofumi SUTO, Tazumi NAGASAWA, Masayuki TAKAGISHI, Naoyuki NARITA, Tomoyuki MAEDA
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Patent number: 11295766Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, a first electrical circuit, and a second electrical circuit. The magnetic head includes a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil. The first electrical circuit is configured to supply a first current to the magnetic pole, the conductive member, and the first shield. The second electrical circuit is configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current. A rise time of the recording current is not less than 65% of a shortest bit length.Type: GrantFiled: February 5, 2021Date of Patent: April 5, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda
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Publication number: 20220005497Abstract: According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a third magnetic layer provided between the second magnetic layer and the second magnetic pole, a first nonmagnetic layer provided between the first and second magnetic layers, a second nonmagnetic layer provided between the second and third magnetic layers, and a third nonmagnetic layer provided between the first magnetic pole and the first magnetic layer. A first magnetic pole length of the first magnetic pole is less than a second magnetic pole length of the second magnetic pole. A first magnetic layer length of the first magnetic layer is greater than a second magnetic layer length of the second magnetic layer.Type: ApplicationFiled: February 17, 2021Publication date: January 6, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki TAKAGISHI, Naoyuki NARITA, Tomoyuki MAEDA, Tazumi NAGASAWA, Hitoshi IWASAKI, Hirofumi SUTO
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Publication number: 20210375312Abstract: According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic pole and the first magnetic layer, a third magnetic layer provided between the first magnetic pole and the second magnetic layer, a first nonmagnetic layer provided between the first magnetic layer and the second magnetic pole, a second nonmagnetic layer provided between the second and first magnetic layers, and a third nonmagnetic layer provided between the third and second magnetic layers. The third magnetic layer includes first and second elements. The first and second magnetic layers do not include the second element. Or concentrations of the second element in the first and second magnetic layers are less than in the third magnetic layer.Type: ApplicationFiled: February 17, 2021Publication date: December 2, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Naoyuki NARITA, Masayuki TAKAGISHI, Hitoshi IWASAKI, Tomoyuki MAEDA
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Publication number: 20210375308Abstract: According to one embodiment, a magnetic head includes a shield, a magnetic pole, a first magnetic layer provided between the shield and the magnetic pole, a second magnetic layer provided between the first magnetic layer and the magnetic pole, a third magnetic layer provided between the second magnetic layer and the magnetic pole, a first nonmagnetic layer provided between the shield and the first magnetic layer, a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer, and a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole. The first and third nonmagnetic layers include one of Cu, Ag, Au, Al, and Ti. The second and fourth nonmagnetic layers include one of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru.Type: ApplicationFiled: August 17, 2021Publication date: December 2, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Tazumi NAGASAWA, Naoyuki NARITA, Hirofumi SUTO, Masayuki TAKAGISHI, Tomoyuki MAEDA
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Patent number: 11138994Abstract: According to one embodiment, a magnetic head includes a shield, a magnetic pole, a first magnetic layer provided between the shield and the magnetic pole, a second magnetic layer provided between the first magnetic layer and the magnetic pole, a third magnetic layer provided between the second magnetic layer and the magnetic pole, a first nonmagnetic layer provided between the shield and the first magnetic layer, a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer, and a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole. The first and third nonmagnetic layers include one of Cu, Ag, Au, Al, and Ti. The second and fourth nonmagnetic layers include one of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru.Type: GrantFiled: September 10, 2019Date of Patent: October 5, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Tazumi Nagasawa, Naoyuki Narita, Hirofumi Suto, Masayuki Takagishi, Tomoyuki Maeda
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Patent number: 11087781Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer, a second magnetic layer, a third magnetic layer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a fourth intermediate layer. The first magnetic layer is provided between the magnetic pole and the first shield. The second magnetic layer is provided between the first magnetic layer and the first shield. The third magnetic layer is provided between the second magnetic layer and the first shield. The first intermediate layer is provided between the magnetic pole and the first magnetic layer. The second intermediate layer is provided between the first magnetic layer and the second magnetic layer. The third intermediate layer is provided between the second magnetic layer and the third magnetic layer. The fourth intermediate layer is provided between the third magnetic layer and the first shield.Type: GrantFiled: March 17, 2020Date of Patent: August 10, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda, Hitoshi Iwasaki, Hirofumi Suto, Tazumi Nagasawa
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Publication number: 20210234158Abstract: Disclosed is an active material that can reduce an interface resistance with a sulfide solid electrolyte and improve the battery performance. The active material exhibits at least one peak in the range of from 0.145 nm to 0.185 nm and at least one peak in the range of from 0.28 nm to 0.31 nm in a radial distribution function obtained through measurement of an X-ray absorption fine structure of the active material. The active material is for use in a solid-state battery. The active material preferably has a core particle, and a coating layer located on the surface of the core particle.Type: ApplicationFiled: September 27, 2019Publication date: July 29, 2021Inventors: Daisuke WASHIDA, Hitohiko IDE, Tetsuya MITSUMOTO, Jun OMURA, Yasuo KOMODA, Yasuhiro SHIBATA, Yasunori TABIRA, Tomoyuki MAEDA
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Patent number: 11062730Abstract: According to one embodiment, a method for evaluating a magnetic head is disclosed. The method can include measuring an electrical characteristic of a current path when an alternating-current magnetic field is applied to the magnetic head. The magnetic head includes the current path. The current path includes an oscillator. The method can include, based on the electrical characteristic, deriving a frequency value relating to an oscillation frequency of the oscillator.Type: GrantFiled: March 11, 2020Date of Patent: July 13, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi Suto, Naoyuki Narita, Tazumi Nagasawa, Masayuki Takagishi, Tomoyuki Maeda
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Patent number: 11062728Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer.Type: GrantFiled: March 13, 2020Date of Patent: July 13, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda, Hirofumi Suto, Tazumi Nagasawa, Katsuya Sugawara
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Publication number: 20210166724Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, a first electrical circuit, and a second electrical circuit. The magnetic head includes a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil. The first electrical circuit is configured to supply a first current to the magnetic pole, the conductive member, and the first shield. The second electrical circuit is configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current. A rise time of the recording current is not less than 65% of a shortest bit length.Type: ApplicationFiled: February 5, 2021Publication date: June 3, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki TAKAGISHI, Naoyuki NARITA, Tomoyuki MAEDA
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Patent number: 11004464Abstract: According to one embodiment, a magnetic head includes first and second shields, a magnetic pole, a first magnetic layer, and a first nonmagnetic member. The first shield includes first, second, and third partial regions. A first direction is from the second toward third partial region. The first partial region is between the second and third partial regions. A second direction from the first toward second shield crosses the first direction. The magnetic pole between the second and third partial regions in the first direction is provided between the first partial region and the second shield in the second direction. The first magnetic layer is provided between the magnetic pole and the second shield. The first nonmagnetic member includes first and second portions. The first portion is between the magnetic pole and the first magnetic layer. The second portion is between the second partial region and the second shield.Type: GrantFiled: September 9, 2020Date of Patent: May 11, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi Suto, Naoyuki Narita, Tazumi Nagasawa, Masayuki Takagishi, Hitoshi Iwasaki, Tomoyuki Maeda