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：US20130258527A1

公开(公告)日：2013-10-03

申请号：US13849791

申请日：2013-03-25

Applicant: TDK CORPORATION

Inventor： Yoshikazu SOENO ,  Takuya ADACHI

IPC: G11B5/48

CPC classification number: G11B5/486 ,  G11B5/6088 ,  G11B2005/0024

Abstract: A magnetic head includes a microwave-generating element connected to a ground line. The ground line is made shorter by connecting the ground line to a conductive slider substrate so that the microwave-generating element is in a short-circuited end condition. This allows a microwave excitation current to be efficiently supplied to the microwave-generating-element, thus enabling effective microwave-assisted recording.

Abstract translation: 磁头包括连接到地线的微波产生元件。 通过将接地线连接到导电滑块基板使接地线更短，使得微波产生元件处于短路结束状态。 这样可以将微波激励电流有效地提供给微波产生元件，从而实现有效的微波辅助记录。

公开(公告)号：US20170309301A1

公开(公告)日：2017-10-26

申请号：US15138347

申请日：2016-04-26

Applicant: TDK Corporation

Inventor： Hirokazu TAKAHASHI ,  Tetsuya ROPPONGI ,  Yoshikazu SOENO

IPC: G11B5/39

CPC classification number: G11B5/3912 ,  G11B5/1278 ,  G11B5/235 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/3146 ,  G11B2005/0024

Abstract: A base multilayer body is made by laminating a seed layer and a buffer layer in respective order. The seed layer is an alloy layer containing tantalum (Ta) and at least one type of other metal, and having an amorphous structure or a microcrystal structure. The buffer layer is an alloy layer having a [001] plane orientation hexagonal close-packed structure and containing at least one type of a group VI metal and at least one type of a group IX metal in the periodic table. With this configuration, a magnetic layer providing a desired magnetic characteristic(s) can be laminated on the thinned base multilayer body.

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：US20170309299A1

公开(公告)日：2017-10-26

申请号：US15138486

申请日：2016-04-26

Applicant: TDK Corporation

Inventor： Zhenyao TANG ,  Tetsuya ROPPONGI ,  Yoshikazu SOENO ,  Hironobu MATSUZAWA ,  Hirokazu TAKAHASHI

IPC: G11B5/127 ,  G11B5/235 ,  G11B5/31 ,  G11B5/00

CPC classification number: G11B5/1278 ,  G11B5/235 ,  G11B5/3116 ,  G11B5/314 ,  G11B5/3146 ,  G11B2005/0024

Abstract: A microwave assisted magnetic head includes a main magnetic pole; a trailing shield; and a spin torque oscillator provided between the main magnetic pole and the trailing shield. The spin torque oscillator has a first end surface configuring a part of an air bearing surface, a second end surface facing the main magnetic pole, and a third end surface facing the first end surface, the first angle θ1 made by the first end surface and the second end surface is smaller than the second angle θ2 formed by the second end surface and the third end surface, and the second angle θ2 is 80 to 100 degrees.

公开(公告)号：US20130242430A1

公开(公告)日：2013-09-19

申请号：US13791306

申请日：2013-03-08

Applicant: TDK CORPORATION

Inventor： Tsutomu AOYAMA ,  Yoshikazu SOENO ,  Akimasa KAIZU

IPC: G11B5/706

CPC classification number: G11B5/70621 ,  G11B5/65 ,  G11B5/70605 ,  G11B5/851

Abstract: Ion irradiation is applied to the surface of a recording layer which has a granular structure containing ferromagnetic particles which are composed of an L10 ordered alloy and a non-magnetic intergranular layer, thereby the ferromagnetic particles in the side of the substrate are transformed into an L10 ordered alloy having a high magnetic anisotropy, and the ferromagnetic particles in the side of the surface of the medium are transformed into an A1 disordered alloy having a low magnetic anisotropy.

Abstract translation: 离子照射被施加到具有包含由L10有序合金和非磁性晶间层构成的铁磁性粒子的粒状结构的记录层的表面，由此将基板侧的铁磁性粒子变换为L10 具有高磁各向异性的有序合金，介质表面侧的铁磁性粒子转变为具有低磁各向异性的A1无序合金。