Min Hui Zheng

7138196, Nov 21, 2006

Jul 29, 2002

10/207698

Min Zheng - Milpitas CA, US
Gunn Choe - San Jose CA, US

Maxtor Corporation - Longmont CO

G11B 5/66
G11B 5/70

428831

A perpendicular magnetic recording medium having good perpendicular magnetic anisotropy. The magnetic recording medium includes a tantalum (Ta) seedlayer and a ruthenium (Ru) underlayer. The magnetic recording layer can be fabricated from cobalt (Co) alloys. With the Ta seedlayer, the perpendicular anisotropy and c-axis orientation of the magnetic recording layer are greatly enhanced. Unity squareness is achievable as is a negative nucleation field. The magnetic recording medium can be formed by sputtering the various layers onto a substrate. Thus, a perpendicular magnetic recording medium suitable for mass production is provided.

7241516, Jul 10, 2007

Mar 3, 2004

10/792328

B. Ramamurthy Acharya - Cupertino CA, US
Jianing Zhou - Fremont CA, US
Gunn Choe - San Jose CA, US
Min Zheng - Milpitas CA, US

Maxtor Corporation - Scotts Valley CA

G11B 5/66
G11B 5/70

4288281

An improved soft underlayer structure for perpendicular magnetic recording. The structure includes at least two soft underlayers separated by a non-magnetic spacer layer. The soft underlayer structure incorporates exchange coupling induced anisotropy for improved perpendicular magnetic recording properties, including an improved signal-to-noise ratio (SNR) and reduced adjacent track erasure.

7588842, Sep 15, 2009

Sep 2, 2005

11/218771

E. Noel Abarra - Santa Clara CA, US
Min Zheng - Milpitas CA, US
Paramjit Gill - Milpitas CA, US

Maxtor Corporation - Longmont CO

G11B 5/66

4288281

A magnetic recording medium and a magnetic recording apparatus for perpendicular magnetic recording. The recording medium includes a magnetically soft underlayer and a hard magnetic pinning layer having perpendicular anisotropy. The magnetically soft underlayer is substantially free of domain walls.

7773341, Aug 10, 2010

Jul 3, 2007

11/825034

Kunliang Zhang - Milpitas CA, US
Min Zheng - Milpitas CA, US
Min Li - Dublin CA, US
Chen-Jung Chien - Sunnyvale CA, US

Headway Technologies, Inc. - Milpitas CA

G11B 5/33

36012511

A laminated main pole layer is disclosed in which a non-AFC scheme is used to break the magnetic coupling between adjacent high moment layers and reduce remanence in a hard axis direction while maintaining a high magnetic moment and achieving low values for Hch, Hce, and Hk. An amorphous material layer with a thickness of 3 to 20 Angstroms and made of an oxide, nitride, or oxynitride of one or more of Hf, Zr, Ta, Al, Mg, Zn, or Si is inserted between adjacent high moment stacks. The laminated structure also includes an alignment layer below each high moment layer within each stack. In one embodiment, a Ru coupling layer is inserted between two high moment layers in each stack to introduce an AFC scheme. An uppermost Ru layer is used as a CMP stop layer. A post annealing process may be employed to further reduce the anisotropy field (Hk).

8054583, Nov 8, 2011

Jun 30, 2008

12/215825

Min Zheng - Milpitas CA, US
Min Li - Dublin CA, US
Chen-Jung Chien - Sunnyvale CA, US
Kowang Liu - Fremont CA, US
Sung Chung - Campbell CA, US

Headway Technologies, Inc. - Milpitas CA

G11B 5/147

3602344

A dynamic fly heater (DFH) for improved lifetime and better film uniformity is disclosed for a magnetic head. The heater has a lower amorphous Ta layer and an upper W layer to promote small grain size and reduced electro-migration. The composite film is especially advantageous for heaters greater than 1000 Angstroms thick where dR/R is difficult to control in the prior art. The DFH may be a (Ta/W)laminate in which the Ta layers are about 30 Angstroms thick and the combined thickness of the W layers is from 400 to 1200 Angstroms. A Ta film is preferably sputter deposited with an Ar pressure of 3 to 5 mTorr and the W film is sputter deposited in the same chamber with a 3 to 20 mTorr Ar pressure. In one embodiment, a merged read/write head has one DFH in the read head and a second DFH in the write head.

8110298, Feb 7, 2012

Mar 3, 2006

11/367821

Gunn Choe - San Jose CA, US
B. Ramamurthy Acharya - Fremont CA, US
Min Zheng - Milpitas CA, US
E. Noel Abarra - Santa Clara CA, US

Seagate Technology LLC - Cupertino CA

G11B 5/66

428827

Perpendicular magnetic recording media having a magnetic capping layer that is exchange coupled to an underlying perpendicular magnetic recording layer. The magnetic coupling layer is a granular layer having a high saturation magnetization (M). The perpendicular magnetic recording layer can include magnetic grains separated by an oxide grain boundary phase.

8329320, Dec 11, 2012

Nov 13, 2008

12/291715

Kunliang Zhang - Fremont CA, US
Min Li - Dublin CA, US
Min Zheng - Milpitas CA, US
Fenglin Liu - Milpitas CA, US
Xiaomin Liu - Fremont CA, US

Headway Technologies, Inc. - Milpitas CA

G11B 5/31
G11B 5/127

428812, 428815, 360324, 360325, 36012501

A laminated high moment film with a non-AFC configuration is disclosed that can serve as a seed layer for a main pole layer or as the main pole layer itself in a PMR writer. The laminated film includes a plurality of (B/M) stacks where B is an alignment layer and M is a high moment layer. Adjacent (B/M) stacks are separated by an amorphous layer that breaks the magnetic coupling between adjacent high moment layers and reduces remanence in a hard axis direction while maintaining a high magnetic moment and achieving low values for Hch, Hce, and Hk. The amorphous material layer may be made of an oxide, nitride, or oxynitride of one or more of Hf, Zr, Ta, Al, Mg, Zn, Ti, Cr, Nb, or Si, or may be Hf, Zr, Ta, Nb, CoFeB, CoB, FeB, or CoZrNb. Alignment layers are FCC soft ferromagnetic materials or non-magnetic FCC materials.

8493694, Jul 23, 2013

Nov 22, 2010

12/927697

Min Zheng - Milpitas CA, US
Kunliang Zhang - Fremont CA, US
Min Li - Dublin CA, US

Headway Technologies, Inc. - Milpitas CA

G11B 5/39

36032412

The free layer of a CPP-TMR sensor is biased by laterally disposed hard bias (HB) layers that include a seedlayer structure, a magnetic layer structure of high coercivity material and a capping layer structure. The magnetic layer structure is a layer of FePt-containing material, such as FePtCu, while the seedlayers and capping layers include layers of Cr, CrTi, Fe, FeCo or FeCoMo. These combinations enable the promotion of the L10 phase of the FePt-containing material which provides a high coercivity magnetic layer structure at much lower annealing temperatures than in the prior art.