Patents by Inventor Weimin Si
Weimin Si has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 9940950Abstract: Various embodiments described herein provide for substrate structures including uniform plating seed layers, and that provide favorable adhesion on dielectric substrate layers. According to some embodiments, a methods for forming a magnetic recording pole is provided comprising: forming an insulator layer; forming a trench in the insulator layer; forming an amorphous seed layer over the insulator layer; forming an adhesion layer over the amorphous seed layer, the adhesion layer comprising a physical vapor deposited (PVD) noble metal; forming a plating seed layer over the adhesion layer, the plating seed layer comprising chemical vapor deposited (CVD) Ru; and forming a magnetic material layer over the plating seed layer.Type: GrantFiled: May 3, 2016Date of Patent: April 10, 2018Assignee: WESTERN DIGITAL (FREMONT), LLCInventors: Wanxue Zeng, Weimin Si, Ying Hong, Lieping Zhong
-
Patent number: 9520146Abstract: A method of forming a wrapped-around shielded perpendicular magnetic recording writer pole is disclosed. A structure comprising a leading shield layer and an intermediate layer disposed over the leading shield layer is provided, the intermediate layer comprising a pole material and a dielectric material. A trench is formed in the dielectric material. A non-magnetic layer in the trench is removed via an ion beam etching process. A seed layer is deposited in the trench and over the pole material. A magnetic material comprising a side shield layer is deposited on at least a portion of the seed layer.Type: GrantFiled: August 21, 2013Date of Patent: December 13, 2016Assignee: Western Digital (Fremont), LLCInventors: Jinwen Wang, Weimin Si, Jianxin Fang, Ying Hong, Hongzhou Jiang, Ching-Huang Lu, Yan Chen, Donghong Li, Lien-Chang Wang, Lieping Zhong, Tao Pan
-
Publication number: 20160247524Abstract: Various embodiments described herein provide for substrate structures including uniform plating seed layers, and that provide favorable adhesion on dielectric substrate layers. According to some embodiments, a methods for forming a magnetic recording pole is provided comprising: forming an insulator layer; forming a trench in the insulator layer; forming an amorphous seed layer over the insulator layer; forming an adhesion layer over the amorphous seed layer, the adhesion layer comprising a physical vapor deposited (PVD) noble metal; forming a plating seed layer over the adhesion layer, the plating seed layer comprising chemical vapor deposited (CVD) Ru; and forming a magnetic material layer over the plating seed layer.Type: ApplicationFiled: May 3, 2016Publication date: August 25, 2016Inventors: WANXUE ZENG, WEIMIN SI, YING HONG, LIEPING ZHONG
-
Patent number: 9349392Abstract: Various embodiments described herein provide for substrate structures including uniform plating seed layers, and that provide favorable adhesion on dielectric substrate layers. According to some embodiments, a methods for forming a magnetic recording pole is provided comprising: forming an insulator layer; forming a trench in the insulator layer; forming an amorphous seed layer over the insulator layer; forming an adhesion layer over the amorphous seed layer, the adhesion layer comprising a physical vapor deposited (PVD) noble metal; forming a plating seed layer over the adhesion layer, the plating seed layer comprising chemical vapor deposited (CVD) Ru; and forming a magnetic material layer over the plating seed layer.Type: GrantFiled: May 24, 2012Date of Patent: May 24, 2016Assignee: Western Digital (Fremont), LLCInventors: Wanxue Zeng, Weimin Si, Ying Hong, Lieping Zhong
-
Patent number: 9082423Abstract: A magnetic transducer has an ABS, a pole, coil(s) and a trailing shield. The pole includes a trailing surface having first and second portions. The first portion adjoins the ABS and is oriented at a first bevel angle from perpendicular to the ABS. The first bevel angle is nonzero and acute. The second portion adjoins the first portion, is recessed from the ABS and oriented at a second bevel angle from perpendicular to the ABS. The second bevel angle is less than the first bevel angle and nonzero. The trailing shield has a pole-facing surface part of which adjoins the ABS and is oriented at the first bevel angle. A write gap is between the trailing shield and the pole. The write gap has a constant thickness for the first portion of the trailing surface and a thickness that increases with increasing distance from the ABS for the second portion.Type: GrantFiled: March 24, 2014Date of Patent: July 14, 2015Assignee: Western Digital (Fremont), LLCInventors: Feng Liu, Zhigang Bai, Weimin Si, Yugang Wang, Fenglin Liu, Tao Pan, Samuel W. Yuan
-
Patent number: 8861133Abstract: A method and system for fabricating magnetic transducer are described. The method and system include providing a main pole having a bottom and a top wider than the bottom. The method and system further include performing a high energy ion mill at an angle from a normal to the top of the main pole and at a first energy. The high energy ion mill removes a portion of the top of the main pole and exposes a top bevel surface for the main pole. The method and system also include performing a low energy ion mill at second energy and a glancing angle from the top bevel surface. The glancing angle is not more than fifteen degrees. The second energy is less than the first energy. The method and system also include depositing a nonmagnetic gap.Type: GrantFiled: May 14, 2013Date of Patent: October 14, 2014Assignee: Western Digital (Fremont), LLCInventors: Weimin Si, Yunfei Li, Ying Hong
-
Patent number: 8711518Abstract: Systems and methods for fabricating a microelectric device are provided herein. Various embodiments provide for systems and methods for fabricating a magnetic recording pole using plasma-enhanced chemical vapor deposition (PECVD) when depositing seed material. For some embodiments, fabrication of the magnetic recording pole may comprise using plasma-enhanced chemical vapor deposition (PECVD) Ru as an adhesion layer for a plating seed layer.Type: GrantFiled: September 27, 2012Date of Patent: April 29, 2014Assignee: Western Digital (Fremont), LLCInventors: Wanxue Zeng, Weimin Si, Ying Hong
-
Patent number: 8670213Abstract: A writer main pole for a perpendicular magnetic recording system is provided. The writer pole has a tunable bottom gap to side gap ratio, and may be formed using deposition of a first seed layer through an ion beam deposition process, deposition of a second seed layer through a physical vapor deposition process, and deposition of a non-magnetic gap layer through a chemical vapor deposition process.Type: GrantFiled: March 16, 2012Date of Patent: March 11, 2014Assignee: Western Digital (Fremont), LLCInventors: Wanxue Zeng, Weimin Si, Ying Hong, Zhigang Bai
-
Patent number: 8628672Abstract: A method for fabricating a magnetic recording transducer having a magnetic writer pole with a short effective throat height is provided. In an embodiment, a writer structure comprising a magnetic writer pole having a trailing bevel and a nonmagnetic stack on the top surface of the writer pole is provided. A dielectric write gap layer comprising alumina is deposited over the trailing bevel section and the nonmagnetic stack; and at least one etch stop layer is deposited over the dielectric write gap layer. A layer of nonmagnetic fill material is deposited over the etch stop layer and to form a nonmagnetic bevel by performing a dry etch process. The etch stop layer(s) are removed from the short throat section; and a trailing shield is deposited over the short throat section, nonmagnetic bevel, and nonmagnetic stack top surface.Type: GrantFiled: June 27, 2012Date of Patent: January 14, 2014Assignee: Western Digital (Fremont), LLCInventors: Weimin Si, Ying Hong, Zhigang Bai, Yunhe Huang, Fenglin Liu, Hong Zhang, Jikou Zhou, Xiaoyu Yang, Yuan Yao, Iulica Zana, Feng Liu, Ling Wang
-
Patent number: 8533937Abstract: A method or forming a wrapped-around shielded perpendicular magnetic recording writer pole is disclosed. A structure comprising a leading shield layer and an intermediate layer disposed over the leading shield layer is provided, the intermediate layer comprising a pole material and a dielectric material. A trench is formed in the dielectric material. A non-magnetic layer in the trench is removed via an ion beam etching process. A seed layer is deposited in the trench and over the pole material. A magnetic material comprising a side shield layer is deposited on at least a portion of the seed layer.Type: GrantFiled: October 18, 2011Date of Patent: September 17, 2013Assignee: Western Digital (Fremont), LLCInventors: Jinwen Wang, Weimin Si, Jianxin Fang, Ying Hong, Hongzhou Jiang, Ching-Huang Lu, Yan Chen, Donghong Li, Lien-Chang Wang, Lieping Zhong, Tao Pan
-
Patent number: 8458892Abstract: A method for fabricating magnetic transducer is described. The method includes providing a main pole having a bottom and a top wider than the bottom. The method further includes performing a high energy ion mill at an angle from a normal to the to of the main pole and at a first energy. The high energy ion mill removes a portion of the top of the main pole and exposes a top bevel surface for the main pole. The method also includes performing a low energy ion mill at second energy and a glancing angle from the top bevel surface. The glancing angle is not more than fifteen degrees. The second energy is less than the first energy. The method and system also include depositing a nonmagnetic gap.Type: GrantFiled: May 11, 2010Date of Patent: June 11, 2013Assignee: Western Digital (Fremont), LLCInventors: Weimin Si, Yun-Fei Li, Ying Hong
-
Patent number: 8375564Abstract: A method provides a pole of magnetic recording transducer. A nonmagnetic stop layer having a thickness and a top surface is provided. A depression that forms a bevel is provided in the stop layer. The bevel has a depth less than the thickness and a bevel angle with respect to a remaining portion of the top surface. The bevel angle is greater than zero and less than ninety degrees. An intermediate layer having a substantially flat top surface is provided over the stop layer. A trench is formed in the intermediate layer via a removal process. The trench has a profile corresponding to the pole. The stop layer is a stop for the removal process. The method also includes providing the pole in the trench. The pole has a leading edge bevel corresponding to the bevel in the stop layer.Type: GrantFiled: December 8, 2009Date of Patent: February 19, 2013Assignee: Western Digital (Fremont), LLCInventors: Guanghong Luo, Danning Yang, Weimin Si, Dujiang Wan, Yun-Fei Li, Lijie Guan, Ming Jiang
-
Patent number: 8349195Abstract: A method and system provide a magnetoresistive structure from a magnetoresistive stack that includes a plurality of layers. The method and system include providing a mask that exposes a portion of the magnetoresistive stack. The mask has at least one side, a top, and a base at least as wide as the top. The method and system also include removing the portion of the magnetoresistive stack to define the magnetoresistive structure. The method and system further include providing an insulating layer. A portion of the insulating layer resides on the at least one side of the mask. The method and system further include removing the portion of the insulating layer on the at least one side of the mask and removing the mask.Type: GrantFiled: June 27, 2008Date of Patent: January 8, 2013Assignee: Western Digital (Fremont), LLCInventors: Weimin Si, Liubo Hong, Honglin Zhu, Winnie Yu, Rowena Schmidt
-
Publication number: 20110279926Abstract: A method and system for fabricating magnetic transducer are described. The method and system include providing a main pole having a bottom and a top wider than the bottom. The method and system further include performing a high energy ion mill at an angle from a normal to the top of the main pole and at a first energy. The high energy ion mill removes a portion of the top of the main pole and exposes a top bevel surface for the main pole. The method and system also include performing a low energy ion mill at second energy and a glancing angle from the top bevel surface. The glancing angle is not more than fifteen degrees. The second energy is less than the first energy. The method and system also include depositing a nonmagnetic gap.Type: ApplicationFiled: May 11, 2010Publication date: November 17, 2011Applicant: WESTERN DIGITAL (FREMONT), LLCInventors: Weimin Si, Yun-Fei Li, Ying Hong
-
Patent number: 6894563Abstract: A technique for automatically controlling the gain of an amplifier by using a transistor as a voltage controlled variable degeneration resistor. The apparatus and method may be advantageously adapted for use in either voltage-to-current amplifiers or voltage-to-voltage amplifiers, single-ended or differential designs. One benefit of this technique is that, since the bias current is constant, the transistors operate in the correct region (i.e. the transistors are not biased out of the operating region). Additionally, the control mechanism is well-bounded.Type: GrantFiled: April 24, 2003Date of Patent: May 17, 2005Assignee: Atheros Communications, Inc.Inventor: Weimin Si
-
Patent number: 6882701Abstract: The invention provides a system and method for microscopic X-ray fluorescence. An X-ray source, X-ray focusing element and a tapered X-ray opaque focusing aperture provide a focused X-ray spot on a sample. The system translates a sample between an imaging position and a testing position. In the imaging position, the sample is aligned in three dimensions and after alignment, the system automatically translates the sample between the imaging position and the testing position. To avoid collision between the sample and other elements of the system, a position detecting device terminates the sample translation if the sample trips the position detecting device. The focusing aperture of the system has a tapered through opening to block unfocused X-rays and reduce or eliminate a halo effect. To detect low atomic number elements, a detector aperture is vacuum sealed to an X-ray detector and X-ray elements of the system are vacuum evacuated.Type: GrantFiled: December 18, 2001Date of Patent: April 19, 2005Assignee: Thermo Noran, Inc.Inventors: Frank H. Ferrandino, Weimin Si, Douglas S. Holmes, Harvey T. Stone
-
Patent number: 6781425Abstract: A current-steering charge pump circuit and method for switch timing that reduces the amount of switching transients on an output current pulse produced by the charge pump. The current-steering type charge pump circuit includes four control signals, UP, UPB, DN and DNB. In order to produce an UP current pulse output signal, the UPB control signal is first asserted, followed by the UP control signal. After a period of time, which is proportional to the error signal that needs to be applied to a VCO, the UPB signal is first unasserted, followed by the UP signal. Similarly, to produce a DOWN current pulse output signal, a DN control is first asserted, followed by a DNB control signal. After a period of time, which is proportional to the error signal that needs to be applied to a VCO, the DN signal is first unasserted, followed by the DNB signal.Type: GrantFiled: September 3, 2002Date of Patent: August 24, 2004Assignee: Atheros Communications, Inc.Inventor: Weimin Si
-
Publication number: 20030042949Abstract: A current-steering charge pump circuit and method for switch timing that reduces the amount of switching transients on an output current pulse produced by the charge pump. The charge pump circuit is especially adapted to control a voltage-controlled oscillator (VCO) in a phase-locked loop circuit.Type: ApplicationFiled: September 3, 2002Publication date: March 6, 2003Applicant: Atheros Communications, Inc.Inventor: Weimin Si
-
Publication number: 20020057759Abstract: The invention provides a system and method for microscopic X-ray fluorescence. An X-ray source, X-ray focusing element and a tapered X-ray opaque focusing aperture provide a focused X-ray spot on a sample. The system translates a sample between an imaging position and a testing position. In the imaging position, the sample is aligned in three dimensions and after alignment, the system automatically translates the sample between the imaging position and the testing position. To avoid collision between the sample and other elements of the system, a position detecting device terminates the sample translation if the sample trips the position detecting device. The focusing aperture of the system has a tapered through opening to block unfocused X-rays and reduce or eliminate a halo effect. To detect low atomic number elements, a detector aperture is vacuum sealed to an X-ray detector and X-ray elements of the system are vacuum evacuated.Type: ApplicationFiled: December 18, 2001Publication date: May 16, 2002Inventors: Frank H. Ferrandino, Weimin Si, Douglas S. Holmes, Harvey T. Stone
-
Patent number: 6345086Abstract: The invention provides a system and method for microscopic X-ray fluorescence. An X-ray source, X-ray focusing element and a tapered X-ray opaque focusing aperture provide a focused X-ray spot on a sample. The system translates a sample between an imaging position and a testing position. In the imaging position, the sample is aligned in three dimensions and after alignment, the system automatically translates the sample between the imaging position and the testing position. To avoid collision between the sample and other elements of the system, a position detecting device terminates the sample translation if the sample trips the position detecting device. The focusing aperture of the system has a tapered through opening to block unfocused X-rays and reduce or eliminate a halo effect. To detect low atomic number elements, a detector aperture is vacuum sealed to an X-ray detector and X-ray elements of the system are vacuum evacuated.Type: GrantFiled: September 14, 1999Date of Patent: February 5, 2002Assignee: Veeco Instruments Inc.Inventors: Frank H. Ferrandino, Weimin Si, Douglas S. Holmes, Harvey T. Stone