公开(公告)号：US20150287430A1

公开(公告)日：2015-10-08

申请号：US14658904

申请日：2015-03-16

Applicant: TDK CORPORATION

Inventor： Tetsuhito SHINOHARA ,  Tsutomu AOYAMA ,  Yoshikazu SOENO

IPC: G11B5/60 ,  G11B5/31 ,  G11B5/11

CPC classification number: G11B5/314 ,  G11B5/3116 ,  G11B5/3146 ,  G11B2005/0024

Abstract: A magnetic head includes a main magnetic pole used to apply a recording signal magnetic field to a magnetic recording medium and also includes a microwave line through which a microwave alternating current is transferred. The microwave line is connected to the main magnetic pole. The entire end surface of the main magnetic pole is positioned closer to air bearing surface than a connection portion at which the microwave line and main magnetic pole are mutually connected. Therefore, microwave assisted magnetic recording is possible without deteriorating the recording signal magnetic field.

Abstract translation: 磁头包括用于将记录信号磁场施加到磁记录介质的主磁极，并且还包括传输微波交流电的微波线。 微波线路连接到主磁极。 主磁极的整个端面比微波线路和主磁极相互连接的连接部分靠近空气轴承表面。 因此，微波辅助磁记录是可能的，而不会使记录信号磁场恶化。

公开(公告)号：US20220231084A1

公开(公告)日：2022-07-21

申请号：US17610339

申请日：2020-05-12

Applicant: TDK CORPORATION

Inventor： Tetsuhito SHINOHARA ,  Takuya ASHIDA ,  Tatsuo SHIBATA

IPC: H01L27/22 ,  H01L43/02 ,  H01L43/10 ,  G11C11/16

Abstract: A magnetic domain wall moving element includes a magnetic recording layer which extends in a first direction and includes a ferromagnetic material, and a first conductive layer and a second conductive layer which are separately connected to the magnetic recording layer, the first conductive layer includes a ferromagnetic first layer in contact with the magnetic recording layer, the first layer includes a mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the mixing layer, and the dissimilar metal is a metal different from each of the ferromagnetic material that mainly constitutes the first layer and the ferromagnetic material that mainly constitutes the magnetic recording layer.

公开(公告)号：US20150170677A1

公开(公告)日：2015-06-18

申请号：US14566028

申请日：2014-12-10

Applicant: TDK CORPORATION

Inventor： Tsutomu AOYAMA ,  Akimasa KAIZU ,  Tetsuhito SHINOHARA ,  Yoshikazu SOENO

IPC: G11B5/09

CPC classification number: G11B5/02 ,  G11B5/3116 ,  G11B5/3146 ,  G11B5/66 ,  G11B2005/0024

Abstract: A magnetic recording and reproducing apparatus includes a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field. The relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt≦0.2. The microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium.

Abstract translation: 一种磁记录和再现装置包括：磁记录介质，其包括在非磁性基板上层叠有至少两个磁性层的记录层; 以及包括用于在基本上垂直于磁记录介质的记录面的方向上施加记录磁场的主磁极的磁头和产生微波磁场的微波产生元件。 构成磁记录介质的记录层的至少两个磁性层中的具有最低磁各向异性能的磁性层的厚度Ts与记录层的厚度Tt之间的关系为Ts / Tt＆nlE; 0.2。 微波产生元件将具有比由磁头的主磁极产生的记录磁场的宽度宽的宽度的微波磁场施加到磁记录介质。

公开(公告)号：US20210398726A1

公开(公告)日：2021-12-23

申请号：US17290118

申请日：2018-11-06

Applicant: TDK CORPORATION

Inventor： Tetsuhito SHINOHARA

IPC: H01F10/32 ,  H01L43/02

Abstract: A domain wall moving type magnetic recording element includes: a domain wall moving layer in which first layers containing a rare earth metal and second layers containing a transition metal are alternately stacked in a first direction; and a first electrode and a second electrode which face the domain wall moving layer and are arranged to be away from each other. The domain wall moving layer has SOT suppression parts which are positioned in one of interfaces between the first layers and the second layers and contain a non-magnetic metal. The SOT suppression parts are locally distributed at the interface.