Patents by Inventor Yuki Nagamine
Yuki Nagamine 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: 11657934Abstract: An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.Type: GrantFiled: March 28, 2019Date of Patent: May 23, 2023Assignee: TDK CORPORATIONInventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
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Patent number: 11302465Abstract: To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18<a<40 and 0.5?b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.Type: GrantFiled: November 30, 2017Date of Patent: April 12, 2022Assignee: TDK CORPORATIONInventors: Ryuji Hashimoto, Masashi Ito, Eiichiro Fukuchi, Yuki Nagamine
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Patent number: 11205532Abstract: A permanent magnet includes R and T (R essentially includes Sm one or more of rare earth elements in addition to Sm, and T essentially includes Fe, or Fe and Co, one or more of transition metal elements in addition to Fe, or Fe and Co). A composition ratio of R in the permanent magnet is 20 at % or more and 40 at % or less. A remaining part is substantially only T, or only T and C. T amount is more than 1.5 times of R amount and less than 4.0 times of the R amount. Main phase grains included in the permanent magnet have an Nd5Fe17 type crystal structure. An average crystal grain size of the main phase grains of the permanent magnet is greater than 1 ?m. A number ratio of main phase grains having a crystal grain size of less than 0.4 ?m is less than 20%.Type: GrantFiled: November 30, 2017Date of Patent: December 21, 2021Assignee: TDK CORPORATIONInventors: Masashi Ito, Yuki Nagamine
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Patent number: 11152142Abstract: An R-T-B based permanent magnet excellent in magnetic properties relatively reduces the amount of a heavy rare earth element used. An R-T-B based permanent magnet, wherein R represents a rare earth element, T an iron group element and B boron, includes main phase grains including an R2T14B crystal phase and grain boundaries formed between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than those in main phase grains. C/R(S)>C/R(C) is satisfied in which C/R(S) represents a C/R ratio (atomic ratio) in R—O—C—N concentrated parts present in a surface of a R-T-B based permanent magnet and C/R(C) represents a C/R ratio (atomic ratio) in the R—O—C—N concentrated parts present in the center of a R-T-B based permanent magnet, and a heavy rare earth element RH is included in the R-T-B based permanent magnet.Type: GrantFiled: March 28, 2019Date of Patent: October 19, 2021Assignee: TDK CORPORATIONInventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
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Patent number: 11078123Abstract: A metal oxynitride thin film having a perovskite structure, in which the metal oxynitride thin film has a composition represented by a compositional formula A1+?BOx+?Ny wherein ? is larger than zero and 0.300 or less, x+? is larger than 2.450, and y is 0.300 or more and 0.700 or less, an AO structure having a layered structure parallel to a plane perpendicular to a c-axis of the perovskite structure and having a composition represented by a general formula AO, and the AO structure is bonded with the perovskite structure and incorporated in the perovskite structure.Type: GrantFiled: November 9, 2018Date of Patent: August 3, 2021Assignee: TDK CORPORATIONInventors: Kumiko Yamazaki, Yuki Nagamine, Takeshi Shibahara, Yuji Umeda, Junichi Yamazaki
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Patent number: 10707018Abstract: A polycrystalline dielectric thin film and a capacitor element have a large relative dielectric constant. The polycrystalline dielectric thin film has a perovskite oxynitride as a principal component. The perovskite oxynitride is represented by compositional formula Aa1Bb1OoNn (a1+b1+o+n=5), and the a-axis length of the crystal lattice of the perovskite oxynitride is larger than a theoretical value.Type: GrantFiled: February 1, 2017Date of Patent: July 7, 2020Assignee: TDK CORPORATIONInventors: Kumiko Yamazaki, Hiroshi Chihara, Yuki Nagamine, Junichi Yamazaki, Yuji Umeda
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Patent number: 10696598Abstract: To provide a dielectric porcelain composition and an electronic component that demonstrate ferroelectricity. A dielectric porcelain composition that is characterized by having a perovskite-type oxynitride as a principal component and by including a polycrystalline body that demonstrates ferroelectricity.Type: GrantFiled: February 1, 2017Date of Patent: June 30, 2020Assignees: TDK CORPORATION, NATIONAL UNIVERSITY CORPORATION HOLLAIDO UNIVERSITYInventors: Kumiko Yamazaki, Yuki Nagamine, Takeshi Shibahara, Shinichi Kikkawa, Yuji Masubuchi
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Patent number: 10611693Abstract: A polycrystalline dielectric thin film and capacitor element has a small dielectric loss tan ?. The polycrystalline dielectric thin film, in which the main composition is a perovskite oxynitride. The perovskite oxynitride is expressed by the compositional formula AaBbOoNn (a+b+o+n=5), where a/b>1 and n?0.7.Type: GrantFiled: February 1, 2017Date of Patent: April 7, 2020Assignee: TDK CORPORATIONInventors: Kumiko Yamazaki, Hiroshi Chihara, Yuki Nagamine, Junichi Yamazaki
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Publication number: 20200020468Abstract: To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18<a<40 and 0.5?b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.Type: ApplicationFiled: November 30, 2017Publication date: January 16, 2020Applicant: TDK CORPORATIONInventors: Ryuji HASHIMOTO, Masashi ITO, Eiichiro FUKUCHI, Yuki NAGAMINE
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Patent number: 10479732Abstract: A dielectric thin film has a main component including an oxynitride having excellent dielectric property, and a capacitance element includes the dielectric thin film. The dielectric thin film has a main component made of an oxynitride expressed by a compositional formula of AaBbOoNn (a+b+o+n=5), wherein “A” is one or more selected from Sr, Ba, Ca, La, Ce, Pr, Nd, and Na, “B” is one or more selected from Ta, Nb, Ti, and W, and crystalline particles constituting the dielectric thin film are polycrystalline which are not oriented to a particular crystal plane orientation, and further the crystalline particles have columnar shape crystals.Type: GrantFiled: March 28, 2018Date of Patent: November 19, 2019Assignee: TDK CORPORATIONInventors: Takeshi Shibahara, Yuki Nagamine, Kumiko Yamazaki
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Patent number: 10475586Abstract: The object of the present invention is to provide a dielectric thin film and a capacitance element having excellent dielectric property. A dielectric thin film comprising a main component comprised of an oxynitride expressed by a compositional formula of AaBbOoNn (a+b+o+n=5), wherein said “A” is one or more selected from the group consisting of Sr, Ba, Ca, La, Ce, Pr, Nd, and Na, said “B” is one or more selected from the group consisting of Ta, Nb, Ti, and W, and crystalline particles constituting said dielectric thin film are polycrystalline which are not aligned to a particular crystal plane orientation, and a size of a crystallite of the crystalline particles included in the dielectric thin film is 100 nm or less.Type: GrantFiled: March 28, 2018Date of Patent: November 12, 2019Assignee: TDK CORPORATIONInventors: Takeshi Shibahara, Yuki Nagamine, Yoshitomo Tanaka, Kumiko Yamazaki
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Publication number: 20190333660Abstract: A permanent magnet includes R and T (R essentially includes Sm one or more of rare earth elements in addition to Sm, and T essentially includes Fe, or Fe and Co, one or more of transition metal elements in addition to Fe, or Fe and Co). A composition ratio of R in the permanent magnet is 20 at % or more and 40 at % or less. A remaining part is substantially only T, or only T and C. T amount is more than 1.5 times of R amount and less than 4.0 times of the R amount. Main phase grains included in the permanent magnet have an Nd5Fe17 type crystal structure. An average crystal grain size of the main phase grains of the permanent magnet is greater than 1 ?m. A number ratio of main phase grains having a crystal grain size of less than 0.4 ?m is less than 20%.Type: ApplicationFiled: November 30, 2017Publication date: October 31, 2019Applicant: TDK CORPORATIONInventors: Masashi ITO, Yuki NAGAMINE
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Patent number: 10453595Abstract: A rare earth permanent magnet includes a main phase composed of a main phase particle and a grain boundary present among a plurality of the main phase particles. The grain boundary includes a region whose electric resistance is higher than that of the main phase.Type: GrantFiled: February 27, 2017Date of Patent: October 22, 2019Assignee: TDK CORPORATIONInventors: Tetsuya Hidaka, Yuki Nagamine, Yoshinori Fujikawa
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Publication number: 20190304640Abstract: An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.Type: ApplicationFiled: March 28, 2019Publication date: October 3, 2019Applicant: TDK CORPORATIONInventors: Yuki NAGAMINE, Masashi MIWA, Yoshinori FUJIKAWA
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Publication number: 20190304638Abstract: An R-T-B based permanent magnet excellent in magnetic properties relatively reduces the amount of a heavy rare earth element used. An R-T-B based permanent magnet, wherein R represents a rare earth element, T an iron group element and B boron, includes main phase grains including an R2T14B crystal phase and grain boundaries formed between main phase grains. Grain boundaries include R-O-C-N concentrated parts where concentrations of R, O, C and N are all higher than those in main phase grains. C/R(S)>C/R(C) is satisfied in which C/R(S) represents a C/R ratio (atomic ratio) in R-O-C-N concentrated parts present in a surface of a R-T-B based permanent magnet and C/R(C) represents a C/R ratio (atomic ratio) in the R-O-C-N concentrated parts present in the center of a R-T-B based permanent magnet, and a heavy rare earth element RH is included in the R-T-B based permanent magnet.Type: ApplicationFiled: March 28, 2019Publication date: October 3, 2019Applicant: TDK CORPORATIONInventors: Yuki NAGAMINE, Masashi MIWA, Yoshinori FUJIKAWA
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Publication number: 20190202744Abstract: To provide a dielectric porcelain composition and an electronic component that demonstrate ferroelectricity. A dielectric porcelain composition that is characterized by having a perovskite-type oxynitride as a principal component and by including a polycrystalline body that demonstrates ferroelectricity.Type: ApplicationFiled: February 1, 2017Publication date: July 4, 2019Applicants: TDK CORPORATION, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Kumiko YAMAZAKI, Yuki NAGAMINE, Takeshi SHIBAHARA, Shinichi KIKKAWA, Yuji MASUBUCHI
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Publication number: 20190144341Abstract: A metal oxynitride thin film having a perovskite structure, in which the metal oxynitride thin film has a composition represented by a compositional formula A1+?BOx+?Ny wherein ? is larger than zero and 0.300 or less, x+? is larger than 2.450, and y is 0.300 or more and 0.700 or less, an AO structure having a layered structure parallel to a plane perpendicular to a c-axis of the perovskite structure and having a composition represented by a general formula AO, and the AO structure is bonded with the perovskite structure and incorporated in the perovskite structure.Type: ApplicationFiled: November 9, 2018Publication date: May 16, 2019Applicant: TDK CORPORATIONInventors: Kumiko YAMAZAKI, Yuki NAGAMINE, Takeshi SHIBAHARA, Yuji UMEDA, Junichi YAMAZAKI
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Patent number: 10256016Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the main phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 25 to 35% for R, 60 to 70% for T and 2 to 10% for M.Type: GrantFiled: December 22, 2014Date of Patent: April 9, 2019Assignee: TDK CORPORATIONInventors: Yoshinori Fujikawa, Yuki Nagamine, Wakako Okawa, Chikara Ishizaka, Eiji Kato, Katsuo Sato
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Publication number: 20190023616Abstract: A polycrystalline dielectric thin film and capacitor element has a small dielectric loss tan ?. The polycrystalline dielectric thin film, in which the main composition is a perovskite oxynitride. The perovskite oxynitride is expressed by the compositional formula AaBbOoNn (a+b+o+n=5), where a/b>1 and n?0.7.Type: ApplicationFiled: February 1, 2017Publication date: January 24, 2019Applicant: TDK CORPORATIONInventors: Kumiko YAMAZAKI, Hiroshi CHIHARA, Yuki NAGAMINE, Junichi YAMAZAKI
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Publication number: 20190019622Abstract: A polycrystalline dielectric thin film and a capacitor element have a large relative dielectric constant. The polycrystalline dielectric thin film has a perovskite oxynitride as a principal component. The perovskite oxynitride is represented by compositional formula Aa1Bb1OoNn (a1+b1+o+n=5), and the a-axis length of the crystal lattice of the perovskite oxynitride is larger than a theoretical value.Type: ApplicationFiled: February 1, 2017Publication date: January 17, 2019Applicant: TDK CORPORATIONInventors: Kumiko YAMAZAKI, Hiroshi CHIHARA, Yuki NAGAMINE, Junichi YAMAZAKI, Yuji UMEDA