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Junjie Quan

from Fremont, CA
Age ~51
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Also known as:
Unjie G Tuan
Phone and address:
44950 Pawnee Dr, Fremont, CA 94539
Related to:
Huihui Wang, 43Hui-Hui WangXiaoyu WangQing Chen Chen, 60Xinhui S Sun, 63Ling Yang, 61Quan Wang Guoquan, 60Yuli Sun, 53Qiang Wang, 48Anhong Hu, 56Cherry C WangJin Yuli, 60
Connected to:
Alejandra N Quan, 35Alexander Quan, 36Amanda B Quan, 49An V Quan, 44Brent A Quan, 67Celia T Quan, 72Christelle M Quan, 54Clara E Quan, 50Dalta M Quan, 79Dan Quan, 54

Junjie Quan Phones & Addresses

  • 44950 Pawnee Dr, Fremont, CA 94539
  • Milpitas, CA
  • Minneapolis, MN
  • Charlottesville, VA

Publications

Us Patents

Magnetoresistive Shield With Lateral Sub-Magnets

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US Patent:
8472147, Jun 25, 2013
Filed:
May 6, 2011
Appl. No.:
13/102751
Inventors:
Eric W. Singleton - Maple Plain MN, US
Junjie Quan - Bloomington MN, US
Jae-Young Yi - Prior Lake MN, US
Assignee:
Seagate Technology LLC - Scotts Valley CA
International Classification:
G11B 5/39
US Classification:
360319, 36032412
Abstract:
A magnetic shield for a magnetoresistive (MR) reader has one or more lateral hard magnets and a ferromagnetic shielding layer with at least one hard sub-magnet in a lateral notch in the shielding layer. The notch allows the shielding layer to contact the sub-magnet on surfaces along multiple normal planes.

Apparatus And Method For Intra-Layer Modulation Of The Material Deposition And Assist Beam And The Multilayer Structure Produced Therefrom

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US Patent:
20030054133, Mar 20, 2003
Filed:
Sep 18, 2002
Appl. No.:
10/246018
Inventors:
Hadyn Wadley - Keswick VA, US
Xiaowang Zhou - Charlottesville VA, US
Junjie Quan - Charlottesville VA, US
International Classification:
B32B001/00
US Classification:
428/141000
Abstract:
A method of producing a multilayer structure by using a physical-vapor deposition apparatus is provided. In general the method includes the steps of: forming a bottom layer having a first material wherein a first plurality of monolayers of the first material is deposited on an underlayer using a low incident adatom energy. Next, a second plurality of monolayers of the first material is deposited on top of the first plurality of monolayers of the first material using a high incident adatom energy. Thereafter, the method further includes forming a second layer having a second material wherein a first plurality of monolayers of the second material is deposited on the second plurality of monolayers of the first material using a low incident adatom energy. Next, a second plurality of monolayers of the second material is deposited on the first plurality of mononlayers of the second material using a high incident adatom energy. Accordingly, the incident energy can be ramped with the thickness of a given layer as the monolayers are accumulated/deposited. For example, the second monolayer has energy less than the third monolayer but more than the first monolayer, i.e., E

Magnetoresistive Shield With Coupled Lateral Magnet Bias

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US Patent:
20120280773, Nov 8, 2012
Filed:
May 6, 2011
Appl. No.:
13/102714
Inventors:
Eric W. Singleton - Maple Plain MN, US
Junjie Quan - Bloomington MN, US
Shaun E. McKinlay - Eden Prairie MN, US
Assignee:
SEAGATE TECHNOLOGY LLC - Scotts Valley CA
International Classification:
H01F 7/00
US Classification:
335301
Abstract:
In accordance with various embodiments, a magnetic shield for a magnetoresistive (MR) element has one or more lateral hard magnets and a coupling layer contactingly adjacent both the MR element and the hard magnet. The coupling layer concurrently magnetically decouples the MR element while magnetically coupling the hard magnet.

Magnetoresistive Shield With Stabilizing Feature

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US Patent:
20120281320, Nov 8, 2012
Filed:
May 6, 2011
Appl. No.:
13/102663
Inventors:
Eric W. Singleton - Maple Plain MN, US
Junjie Quan - Bloomington MN, US
Jae-Young Yi - Prior Lake MN, US
Shaun E. McKinlay - Eden Prairie MN, US
Assignee:
Seagate Technology LLC - Scotts Valley CA
International Classification:
G11B 5/39
US Classification:
360319, G9B 5113
Abstract:
A magnetoresistive (MR) reader is adjacent to at least one shield that extends from an air bearing surface (ABS) a first distance. The shield has a stabilizing feature that is contactingly adjacent the MR reader and extends from the ABS a second distance that is less than the first distance.

Shield Stabilization Configuration With Applied Bias

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US Patent:
20120327537, Dec 27, 2012
Filed:
Jun 23, 2011
Appl. No.:
13/167142
Inventors:
Eric Walter Singleton - Maple Plain MN, US
Junjie Quan - Bloomington MN, US
Jae-Young Yi - Shakopee MN, US
Assignee:
Seagate Technology LLC - Cupertino CA
International Classification:
G11B 5/48
H01F 13/00
C22F 1/00
H05K 9/00
US Classification:
360244, 361818, 148121, G9B 5147
Abstract:
An apparatus includes a sensor stack, first and second shields positioned on opposite sides of the sensor stack, and a first shield stabilization structure adjacent to the first shield and applying a bias magnetic field to the first shield. A second shield stabilization structure can be positioned adjacent to the second shield.

Apparatus And Method For Intra-Layer Modulation Of The Material Deposition And Assist Beam And The Multilayer Structure Produced Therefrom

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US Patent:
6478931, Nov 12, 2002
Filed:
Aug 7, 2000
Appl. No.:
09/634457
Inventors:
Hadyn N. G. Wadley - Keswick VA
Xiaowang Zhou - Charlottesville VA
Junjie Quan - Charlottesville VA
Assignee:
University of Virginia Patent Foundation - Charlottesville VA
International Classification:
C23C 1434
US Classification:
20419212, 20419211, 20419215, 2041922, 20429804, 20429806, 20429808, 118723 R, 118723 MP, 427162, 4272557, 427402
Abstract:
A method of producing a multilayer structure that has reduced interfacial roughness and interlayer mixing by using a physical-vapor deposition apparatus. In general the method includes forming a bottom layer having a first material wherein a first plurality of monolayers of the first material is deposited on an underlayer using a low incident adatom energy. Next, a second plurality of monolayers of the first material is deposited on top of the first plurality of monolayers of the first material using a high incident adatom energy. Thereafter, the method further includes forming a second layer having a second material wherein a first plurality of monolayers of the second material is deposited on the second plurality of monolayers of the first material using a low incident adatom energy. Next, a second plurality of monolayers of the second material is deposited on the first plurality of monolayers of the second material using a high incident adatom energy.

Bias Layer And Shield Biasing Design

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US Patent:
20170084296, Mar 23, 2017
Filed:
Nov 30, 2016
Appl. No.:
15/364304
Inventors:
- Milpitas CA, US
Yan Wu - Cupertino CA, US
Junjie Quan - Fremont CA, US
Yewhee Chye - Hayward CA, US
International Classification:
G11B 5/39
Abstract:
A read head is longitudinally biased unidirectionally by laterally abutting soft magnetic layers or multilayers. The soft magnetic layers are themselves magnetically stabilized by layers of antiferromagnetic material that are exchange coupled to them. The same layers of antiferromagnetic materials can be used to stabilize a unidirectional anisotropy of an overhead shield by means of exchange coupling. By including the antiferromagnetic material layer within the patterned biasing structure itself, an additional layer of antiferromagnetic material that normally covers the entire sensor structure is eliminated. The elimination of an entire layer is also advantageous for reducing the inter-sensor spacing in a TDMR (two dimensional magnetic recording) configuration where two sensor are vertically stacked on top of each other.

Bias Layer And Shield Biasing Design

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US Patent:
20170069341, Mar 9, 2017
Filed:
Sep 9, 2015
Appl. No.:
14/848376
Inventors:
- Milpitas CA, US
Yan Wu - Cupertino CA, US
Junjie Quan - Fremont CA, US
Yewhee Chye - Hayward CA, US
International Classification:
G11B 5/39
Abstract:
A read head is longitudinally biased unidirectionally by laterally abutting soft magnetic layers or multilayers. The soft magnetic layers are themselves magnetically stabilized by layers of antiferromagnetic material that are exchange coupled to them. The same layers of antiferromagnetic materials can be used to stabilize a unidirectional anisotropy of an overhead shield by means of exchange coupling. By including the antiferromagnetic material layer within the patterned biasing structure itself, an additional layer of antiferromagnetic material that normally covers the entire sensor structure is eliminated. The elimination of an entire layer is also advantageous for reducing the inter-sensor spacing in a TDMR (two dimensional magnetic recording) configuration where two sensor are vertically stacked on top of each other.
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Junjie Quan from Fremont, CA, age ~51 Get Report