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1. 发明授权

US09728210B2 Texture-control layer for spin torque oscillator 有权
公开(公告)号：US09728210B2
公开(公告)日：2017-08-08
申请号：US14952682
申请日：2015-11-25
申请人： HGST Netherlands B.V.
发明人： Susumu Okamura , Yo Sato , Keiichi Nagasaka , Masashige Sato
IPC分类号： G11B5/235 , G11B5/31 , G11B5/127 , G11B5/00
CPC分类号： G11B5/3146 , G11B5/1278 , G11B5/235 , G11B5/314 , G11B2005/0024
摘要： A magnetic field-assisted magnetic recording (MAMR) head is provided, which includes a recording main pole and a texture control layer (TCL), a seed control layer, and a spin torque oscillator (STO) positioned over the main pole, in this order, in a stacking direction from a leading side to a trailing side of the recording head. The STO has a crystallographic preferred growth orientation and includes a spin polarized layer (SPL). The TCL may include a Cu layer.

2. 发明授权

US09336797B2 Extended spin torque oscillator 有权
标题翻译：扩展自旋扭矩振荡器
公开(公告)号：US09336797B2
公开(公告)日：2016-05-10
申请号：US14290768
申请日：2014-05-29
申请人： HGST Netherlands B.V.
发明人： Masukazu Igarashi , Masato Matsubara , Keiichi Nagasaka , Yo Sato , Masato Shiimoto , Masashige Sato
IPC分类号： G11B5/00 , G11B5/127
CPC分类号： G11B5/00 , G11B5/1278 , G11B5/23 , G11B5/235 , G11B5/3146 , G11B2005/0024
摘要： The present disclosure generally relates to a high-frequency oscillator for use in a recording device having a microwave-assisted magnetic recording head. The microwave-assisted magnetic recording head achieves a large assist effect by using an extended spin torque oscillator disposed between a main magnetic pole and a pole opposite the main magnetic pole. The spin torque oscillator obtains a strong high-frequency magnetic field and comprises a first non-magnetic spin scatterer, a reference layer, a first non-magnetic spin transfer layer, a first magnetic field generating layer, a second non-magnetic spin transfer layer, a second magnetic field generating layer, and a second non-magnetic spin scatterer. The spin torque oscillator has a drive current flowing though in the direction from the first magnetic field generating layer to the reference layer.
摘要翻译：本公开总体上涉及用于具有微波辅助磁记录头的记录装置中的高频振荡器。微波辅助磁记录头通过使用设置在主磁极和与主磁极相对的极之间的扩展旋转扭矩振荡器来实现大的辅助效果。旋转扭矩振荡器获得强的高频磁场，并且包括第一非磁性旋转散射体，参考层，第一非磁性自旋转移层，第一磁场产生层，第二非磁性自旋转移层，第二磁场产生层和第二非磁性旋转散射体。自旋转矩振荡器具有沿着从第一磁场产生层到参考层的方向流动的驱动电流。

3. 发明授权

US09099107B1 Stabilizing layer for a spin torque oscillator (STO) 有权
标题翻译：自旋扭矩振荡器稳定层（STO）
公开(公告)号：US09099107B1
公开(公告)日：2015-08-04
申请号：US14604635
申请日：2015-01-23
申请人： HGST Netherlands B.V.
发明人： Masukazu Igarashi , Keiichi Nagasaka , Susumu Okamura , Yo Sato , Masashige Sato , Masato Shimoto
IPC分类号： G11B5/31
CPC分类号： G11B5/31 , G11B5/1278 , G11B5/235 , G11B5/3146 , G11B2005/0024
摘要： In one embodiment, a spin torque oscillator (STO) includes a reference layer having a magnetization that is capable of free in-plane rotation, a field generation layer (FGL) including at least one magnetic film having an easy magnetization plane effectively in a film plane, wherein a magnetization of the FGL is capable of in-plane rotation, and a stabilizing layer (STL) positioned on a side of the FGL opposite the reference layer, the STL including a magnetic film having an easy magnetization plane effectively in a film plane, wherein a magnetization of the STL is capable of in-plane rotation, wherein a product of a saturation magnetization of the STL multiplied by a thickness of the STL is less than half a product of a magnetization of the FGL multiplied by a thickness of the FGL.
摘要翻译：在一个实施例中，自旋转矩振荡器（STO）包括具有能够自由进行平面内旋转的磁化的参考层，在膜中有效地包括至少一个具有易磁化平面的磁性膜的场产生层（FGL）平面，其中所述FGL的磁化能够进行平面内旋转，并且位于所述FGL的与所述参考层相对的一侧的稳定层（STL），所述STL在膜中有效地包括具有易磁化平面的磁性膜平面，其中STL的磁化能够进行平面内旋转，其中STL的饱和磁化强度乘以STL的厚度的乘积小于FGL的磁化强度的乘积的乘积乘以 FGL。

4. 发明申请

US20180005651A1 MICROWAVE ASSISTED MAGNETIC RECORDING HEAD HAVING SPIN TORQUE OSCILLATOR FREQUENCY DETECTION 有权
公开(公告)号：US20180005651A1
公开(公告)日：2018-01-04
申请号：US15199833
申请日：2016-06-30
申请人： HGST Netherlands B.V.
发明人： Masashige Sato , Susumu Okamura , Yo Sato , Keiichi Nagasaka
IPC分类号： G11B5/39
CPC分类号： G11B5/314 , G11B5/3146 , G11B5/3163 , G11B2005/0024
摘要： A magnetic write head having a spin torque oscillator with a magnetic field sensor for accurately determining magnetic field oscillation frequency. The spin torque oscillator has one or more tunnel junction (TMR) sensors formed at the side of the spin torque oscillator. The TMR sensor advantageously detects a magnetic field signal that is an additive signal of both fields from the spin polarization layer and the magnetic field generation layer, thereby providing efficient detection of magnetic field and associated oscillation frequency.

5. 发明授权

US09406315B2 AF-mode STO with negative Hk spin polarization layer 有权
标题翻译：具有负Hk自旋极化层的AF模式STO
公开(公告)号：US09406315B2
公开(公告)日：2016-08-02
申请号：US14179358
申请日：2014-02-12
申请人： HGST Netherlands B.V.
发明人： Masato Shiimoto , Masukaza Igarashi , Keiichi Nagasaka , Yo Sato
IPC分类号： G11B5/235 , G11B5/31 , G11B5/127 , G11B5/00
CPC分类号： G11B5/1278 , G11B5/235 , G11B5/3146 , G11B2005/0024
摘要： The embodiments disclosed generally relate to an STO structure for a magnetic head. The STO structure has an FGL having a greater thickness than the SPL. The SPL may have multiple layers. In one embodiment, a MAMR head comprises a main pole; a trailing shield; and an STO coupled between the main pole and the trailing shield. The STO includes: a first magnetic layer having a first thickness; a non-magnetic spacer layer coupled to the first magnetic layer; and a second magnetic layer having a second thickness and coupled to the non-magnetic spacer layer, wherein the first thickness is greater than the second thickness, wherein a current is charged from the first magnetic layer to the second magnetic layer, and wherein a vertical magnetic anisotropy field of the second magnetic film is less than 0 kOe.
摘要翻译：所公开的实施例通常涉及用于磁头的STO结构。 STO结构具有比SPL更大的厚度的FGL。 SPL可能有多个层。在一个实施例中，MAMR头包括主极; 后盾以及耦合在主极和后盾之间的STO。 STO包括：具有第一厚度的第一磁性层; 耦合到所述第一磁性层的非磁性间隔层; 以及具有第二厚度并耦合到非磁性间隔层的第二磁性层，其中所述第一厚度大于所述第二厚度，其中电流从所述第一磁性层充电到所述第二磁性层，并且其中垂直第二磁性膜的磁各向异性场小于0kOe。

6. 发明授权

US08970996B2 Spin-torque oscillator for microwave assisted magnetic recording 有权
标题翻译：用于微波辅助磁记录的旋转扭矩振荡器
公开(公告)号：US08970996B2
公开(公告)日：2015-03-03
申请号：US13629401
申请日：2012-09-27
申请人： HGST Netherlands B.V.
发明人： Keiichi Nagasaka , Masato Shiimoto , Masato Matsubara , Yuta Udou
IPC分类号： G11B5/127
CPC分类号： G11B5/314 , G11B2005/0024
摘要： A microwave assisted magnetic recording write head having a spin torque oscillator capable of producing high strength high frequency magnetic oscillations with reduced applied current. The spin torque oscillator uses a magnetic field generation layer with a high moment material including such as Fe and Co that is formed on an interlayer having a face centered cubic (fcc) crystal structure, that functions as an under-layer. The high moment magnetic field generation layer has also reduced magnetic damping.
摘要翻译：具有能够以降低的施加电流产生高强度高频磁振荡的自旋扭矩振荡器的微波辅助磁记录写头。自旋扭矩振荡器使用具有高力矩材料的磁场产生层，其包括诸如Fe和Co，其形成在具有面心立方（fcc）晶体结构的层间，其用作底层。高力矩磁场产生层也减少了磁阻力。

7. 发明授权

US09437222B1 Spin torque oscillator with high spin torque efficiency and reliability 有权
标题翻译：旋转扭矩振荡器具有高自旋转矩效率和可靠性
公开(公告)号：US09437222B1
公开(公告)日：2016-09-06
申请号：US14726513
申请日：2015-05-30
申请人： HGST Netherlands B.V.
发明人： Susumu Okamura , Masao Shiimoto , Katsuro Watanabe , Masashige Sato , Keiichi Nagasaka , Yo Sato , Masukazu Igarashi
IPC分类号： G11B5/31 , G11B5/235 , H03B15/00 , G11B5/127 , G11B5/00
CPC分类号： G11B5/3146 , G11B5/1278 , G11B5/235 , G11B5/314 , G11B2005/0024 , H03B15/006
摘要： A magnetic oscillator for use in Microwave Assisted Magnetic Recording (MAMR). The magnetic oscillator can be a spin torque oscillator and includes a magnetic spin polarization layer, a magnetic field generation layer and a non-magnetic intermediate layer sandwiched between the magnetic spin polarization layer and the magnetic field generation layer. The non-magnetic intermediate layer is constructed of a material that provides improved performance, increased lifespan and thermal robustness. The magnetic intermediate layer is constructed of an alloy of Ag and an element X. More preferably the element X can be Sn or Zn.
摘要翻译：用于微波辅助磁记录（MAMR）的磁振荡器。磁振荡器可以是自旋扭矩振荡器，并且包括磁自旋极化层，磁场产生层和夹在磁自旋极化层和磁场产生层之间的非磁性中间层。非磁性中间层由提供改进的性能，寿命延长和热稳定性的材料构成。磁性中间层由Ag和元素X的合金构成。更优选地，元素X可以是Sn或Zn。

8. 发明授权

US09378759B2 Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material 有权
标题翻译：具有低磁矩和高垂直磁各向异性材料的自旋扭矩振荡器
公开(公告)号：US09378759B2
公开(公告)日：2016-06-28
申请号：US14548853
申请日：2014-11-20
申请人： HGST Netherlands B.V.
发明人： Keiichi Nagasaka , Yo Sato , Masashige Sato , Susumu Okamura , Masato Shiimoto , Masukazu Igarashi
IPC分类号： G11B5/31 , G11B5/35 , G11B5/00
CPC分类号： G11B5/35 , G11B5/314 , G11B5/607 , G11B2005/0024
摘要： Embodiments disclosed herein generally relate to a magnetic disk device employing a MAMR head. The MAMR head includes an STO. The STO comprises an underlayer, an SPL, an interlayer, an FGL, and a capping layer. The SPL is comprised of a high perpendicular magnetic anisotropy material. The SPL has a large effective perpendicular magnetic anisotropy field, and the SPL has a lower magnetic moment than the FGL. An applied current is adapted to flow in a direction from the FGL to the SPL resulting in the magnetization direction of the SPL being almost perpendicular to the FGL and anti-parallel to a head-gap magnetic field due to a relation between a first spin torque directed from the SPL to the FGL and a second spin torque directed from the FGL to the SPL.
摘要翻译：本文公开的实施例通常涉及采用MAMR头的磁盘装置。 MAMR头包括STO。 STO包括底层，SPL，中间层，FGL和覆盖层。 SPL由高垂直磁各向异性材料组成。 SPL具有大的有效垂直磁各向异性场，SPL具有比FGL低的磁矩。施加的电流适于沿着从FGL到SPL的方向流动，导致SPL的磁化方向几乎垂直于FGL，并且由于第一自旋转矩之间的关系而与头间隙磁场反平行从SPL引导到FGL，以及从FGL指向SPL的第二自旋扭矩。

9. 发明授权

US09230597B2 Magnetic head having a spin torque oscillator (STO) with a hybrid heusler field generation layer (FGL) 有权
标题翻译：具有具有混合heusler场产生层（FGL）的自旋扭矩振荡器（STO）的磁头，
公开(公告)号：US09230597B2
公开(公告)日：2016-01-05
申请号：US14070401
申请日：2013-11-01
申请人： HGST Netherlands B.V.
发明人： Masato Shimoto , Keiichi Nagasaka , Masato Matsubara , Yo Sato
IPC分类号： G11B5/127 , G11B23/00 , G11B5/31 , G11B5/00
CPC分类号： G11B23/0057 , G11B5/1278 , G11B5/314 , G11B5/3146 , G11B2005/0024 , Y10T29/49055
摘要： In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium, a trailing shield positioned on a trailing side of the main pole, and a STO between the main pole and the trailing shield, wherein the STO includes a laminated structure having a FGL, a spun polarization layer (SPL), and a non-magnetic spacer positioned between the FGL and the SPL, wherein the FGL includes a laminated structure having one or more layers of a CoFe alloy and a Heusler alloy alternately laminated in this order from an end of the FGL closest to the non-magnetic spacer. In another embodiment, a method is presented for forming such a magnetic head utilizing a FGL that includes a laminated structure baying layers of a CoFe alloy and a Heusler alloy alternately laminated in this order from an end of the FGL closest to the non-magnetic spacer.
摘要翻译：在一个实施例中，磁头包括被配置为将数据写入磁介质的主极，位于主极的后侧的后屏蔽和主极与后屏蔽之间的STO，其中STO包括具有FGL的层压结构，旋转偏振层（SPL）和位于FGL和SPL之间的非磁性间隔件，其中FGL包括具有一层或多层CoFe合金和Heusler合金交替层压的层压结构按照从最接近非磁性间隔物的FGL的一端的顺序。在另一个实施例中，提出了一种使用FGL形成这种磁头的方法，所述FGL包括从最接近非磁性间隔物的FGL的端部依次层叠的CoFe合金和Heusler合金的叠层结构的层叠结构。

10. 发明授权

US09230569B1 Low Bs spin-polarizer for spin torque oscillator 有权
标题翻译：低Bs自旋偏振器用于自旋扭矩振荡器
公开(公告)号：US09230569B1
公开(公告)日：2016-01-05
申请号：US14555484
申请日：2014-11-26
申请人： HGST Netherlands B.V.
发明人： Masato Shimoto , Masukazu Igarashi , Keiichi Nagasaka , Yo Sato , Susumu Okamura , Masashige Sato
IPC分类号： G11B5/147
CPC分类号： G11B5/147 , G11B5/314 , G11B2005/0024
摘要： In one embodiment, a magnetic head includes a main magnetic pole positioned configured to generate a writing magnetic field when current is applied to a write coil, and a spin torque oscillator (STO) located adjacent the main magnetic pole, the STO being configured to generate a high frequency magnetic field when current is applied thereto, wherein the high frequency magnetic field is generated simultaneously to the writing magnetic field to assist in reversing magnetization of a magnetic recording medium. The STO includes: a spin polarization layer (SPL), a field generation layer (FGL) positioned adjacent the SPL, and one or more interlayers positioned between the SPL and the FGL, and a magnetization easy axis of the SPL is positioned in an in-plane direction such that the SPL has no perpendicular magnetic anisotropy.
摘要翻译：在一个实施例中，磁头包括主磁极，其被配置为当电流施加到写入线圈时产生写入磁场，以及位于主磁极附近的自旋扭矩振荡器（STO），STO被配置为产生当施加电流时的高频磁场，其中与写入磁场同时产生高频磁场，以帮助磁记录介质的磁化反转。 STO包括：位于SPL附近的自旋极化层（SPL），场产生层（FGL）和位于SPL与FGL之间的一个或多个夹层，并且SPL的易磁化轴位于平面方向使得SPL没有垂直的磁各向异性。

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