Abstract: 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 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 second and first magnetic layers, a second nonmagnetic layer provided between the third and second magnetic layers, and a third nonmagnetic layer provided between the first magnetic pole and the third magnetic layer. The second magnetic layer includes first and second magnetic regions. The second magnetic region is between the second nonmagnetic layer and the first magnetic region. The first magnetic region includes a first element. The second magnetic region includes the first element, and a second element.

Abstract: 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.

Abstract: 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 member, a second magnetic member provided between the first and second magnetic members, and a first layer provided between the first and second magnetic members, and including at least one selected from the group consisting of Cr, V, Mn, Ti and Sc. The first magnetic member includes first magnetic regions and a first non-magnetic region. A direction from one of the first magnetic regions toward another one of the first magnetic regions is along a first direction from the first magnetic pole toward the second magnetic pole. The first non-magnetic region is between the one of the first magnetic regions and the other one of the first magnetic regions.

Abstract: 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.

Abstract: 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.

Abstract: 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 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 second and first magnetic layers, a second nonmagnetic layer provided between the third and second magnetic layers, and a third nonmagnetic layer provided between the first magnetic pole and the third magnetic layer. The second magnetic layer includes first and second magnetic regions. The second magnetic region is between the second nonmagnetic layer and the first magnetic region. The first magnetic region includes a first element. The second magnetic region includes the first element, and a second element.

Abstract: A flexible connector comprises a first plurality of pads disposed within an integrated circuit (IC) area, a second plurality of pads disposed in the IC area, and a plurality of through holes disposed in the IC area. The flexible connector further comprises first wiring coupled to the plurality of through holes and the first plurality of pads, and a rigidity element at least partially disposed between the plurality of through holes and the second plurality of pads.

Abstract: 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.

Abstract: According to one embodiment, a magnetic head includes a recording portion. The recording portion includes a magnetic pole, a shield, and a stacked body provided between the magnetic pole and the shield. The stacked body includes a first magnetic layer, a first layer provided between the first magnetic layer and the magnetic pole, and a first intermediate layer provided between the first magnetic layer and the shield. The first layer contacts the magnetic pole and includes at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr. The first intermediate layer includes at least one selected from a first group consisting of Cu, Ag, Au, Al, Cr, and Ru.

Abstract: 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.

Abstract: 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 member, a second magnetic member provided between the first magnetic member and the second magnetic pole, a first layer provided between the first and second magnetic members, and a second layer provided between the second magnetic member and the second magnetic pole. The first magnetic member includes first magnetic regions and a first nonmagnetic region. The first nonmagnetic region is between the one of the first magnetic regions and the other one of the first magnetic regions. The second magnetic member includes second magnetic regions and a second nonmagnetic region. The second nonmagnetic region is between the one of the second magnetic regions and the other one of the second magnetic regions.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: According to one embodiment, a magnetic head includes a recording portion. The recording portion includes a magnetic pole, a shield, and a stacked body provided between the magnetic pole and the shield. The stacked body includes a first magnetic layer, a first layer provided between the first magnetic layer and the magnetic pole, and a first intermediate layer provided between the first magnetic layer and the shield. The first layer contacts the magnetic pole and includes at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr. The first intermediate layer includes at least one selected from a first group consisting of Cu, Ag, Au, Al, Cr, and Ru.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, and an electrical circuit. The magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and the second magnetic poles. The stacked body includes a first nonmagnetic layer, a first magnetic layer provided between the first nonmagnetic layer and the second magnetic pole, a first layer provided between the first magnetic layer and the second magnetic pole, a second nonmagnetic layer provided between the first layer and the second magnetic pole, a second magnetic layer provided between the second nonmagnetic layer and the second magnetic pole, and a third nonmagnetic layer provided between the second magnetic layer and the second magnetic pole. The electrical circuit supplies, to the stacked body, a first current having a first orientation from the second magnetic pole toward the first magnetic pole.

Abstract: 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.