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公开(公告)号：US12080325B2
公开(公告)日：2024-09-03
申请号：US18336085
申请日：2023-06-16
CPC分类号： G11B5/21 , G11B5/1278 , G11B5/3146
摘要： 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 first nonmagnetic layer provided between the first and second magnetic layers, a second nonmagnetic layer provided between the second magnetic layer and the second magnetic pole, and a third nonmagnetic 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 (Fe100-xCox)100-yEy. A second element E includes at least one selected from the group consisting of Cr, V, Mn, Yi, and Sc. The first magnetic layer does not include the second element.
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公开(公告)号：US11488623B2
公开(公告)日：2022-11-01
申请号：US17389951
申请日：2021-07-30
摘要： 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.
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公开(公告)号：US11462239B2
公开(公告)日：2022-10-04
申请号：US17404909
申请日：2021-08-17
摘要： 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.
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公开(公告)号：US11087781B2
公开(公告)日：2021-08-10
申请号：US16820917
申请日：2020-03-17
发明人： Masayuki Takagishi , Naoyuki Narita , Tomoyuki Maeda , Hitoshi Iwasaki , Hirofumi Suto , Tazumi Nagasawa
摘要： 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.
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公开(公告)号：US10978098B1
公开(公告)日：2021-04-13
申请号：US17015534
申请日：2020-09-09
发明人： Naoyuki Narita , Masayuki Takagishi , Hirofumi Suto , Hitoshi Iwasaki , Tazumi Nagasawa , Tomoyuki Maeda
摘要： According to the embodiment, a magnetic recording device includes a magnetic head, a magnetic recording medium, and an electrical circuit. The magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes first, and second magnetic layers, first, second, and third nonmagnetic layers. An electrical resistance of the stacked body is a first resistance when a current flowing in the stacked body is a first current. The electrical resistance is a second resistance when the current flowing in the stacked body is a second current. The electrical resistance oscillates when the current flowing in the stacked body is a third current. The electrical circuit is configured to supply the second current to the stacked body in a recording operation of using the magnetic head to record information in the magnetic recording medium.
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公开(公告)号：US11380352B2
公开(公告)日：2022-07-05
申请号：US17015688
申请日：2020-09-09
摘要： According to one embodiment, a magnetic recording device includes a magnetic head, and an electrical circuit. The magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first magnetic layer, a second magnetic layer, a first layer provided between the first and second magnetic layers, and a first nonmagnetic layer provided between the first magnetic layer and the first layer. A change rate of an electrical resistance of the stacked body with respect to a change of a current density flowing in the stacked body has a first value when the current density is in a first range, a second value when the current density is in a second range, and a third value when the current density is in a third range.
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公开(公告)号：US11217272B2
公开(公告)日：2022-01-04
申请号：US17015493
申请日：2020-09-09
摘要： 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.
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公开(公告)号：US11138994B2
公开(公告)日：2021-10-05
申请号：US16565749
申请日：2019-09-10
摘要： 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.
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公开(公告)号：US10607638B2
公开(公告)日：2020-03-31
申请号：US16675279
申请日：2019-11-06
摘要： According to one embodiment, a magnetic head includes a reproducing portion. The reproducing portion includes first to fourth magnetic portions and a stacked body. The third magnetic portion is provided between the first and second magnetic portions. The fourth magnetic portion is provided between the first and second magnetic portions. A second direction from the third magnetic portion toward the fourth magnetic portion crosses a first direction from the first magnetic portion toward the second magnetic portion. The stacked body is provided between the first and second magnetic portions in the first direction and between the third and fourth magnetic portions in the second direction. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic portion in the first direction, and an intermediate layer provided between the first and second magnetic layers in the first direction.
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公开(公告)号：US10127931B2
公开(公告)日：2018-11-13
申请号：US15266161
申请日：2016-09-15
发明人： Hirofumi Suto , Kiwamu Kudo , Tazumi Nagasawa , Taro Kanao , Rie Sato , Koichi Mizushima
摘要： According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.
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