Patents by Inventor Oleksandr Mosendz

Oleksandr Mosendz 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: 10726893
    Abstract: A perpendicular spin orbit torque MRAM memory cell comprises a magnetic tunnel junction that includes a free layer in a plane, a ferromagnetic layer and a spacer layer between the ferromagnetic layer and the free layer. The free layer comprises a switchable direction of magnetization perpendicular to the plane. The ferromagnetic layer is configured to generate perpendicularly polarized spin current in response to an electrical current through the ferromagnetic layer and inject the perpendicularly polarized spin current through the spacer layer into the free layer to change the direction of magnetization of the free layer.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: July 28, 2020
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Goran Mihajlovic, Oleksandr Mosendz
  • Publication number: 20200043538
    Abstract: A perpendicular spin orbit torque MRAM memory cell comprises a magnetic tunnel junction that includes a free layer in a plane, a ferromagnetic layer and a spacer layer between the ferromagnetic layer and the free layer. The free layer comprises a switchable direction of magnetization perpendicular to the plane. The ferromagnetic layer is configured to generate perpendicularly polarized spin current in response to an electrical current through the ferromagnetic layer and inject the perpendicularly polarized spin current through the spacer layer into the free layer to change the direction of magnetization of the free layer.
    Type: Application
    Filed: December 12, 2018
    Publication date: February 6, 2020
    Applicant: SANDISK TECHNOLOGIES LLC
    Inventors: Goran Mihajlovic, Oleksandr Mosendz
  • Publication number: 20170133588
    Abstract: Embodiments disclosed herein generally relate to an electrode structure for a resistive random access memory (ReRAM) device cell which focuses the electric field at a center of the cell and methods for making the same. As such, a non-uniform metallic electrode may be deposited onto the ReRAM device which is subsequently exposed to an oxidation or nitrogenation process during cell fabrication. The electrode structure may be conical or pyramid shaped, and comprise at least one layer comprising a first material and a second material, wherein the concentration of the first material and the second material are varied based on location within the electrode. A metal electrode profile is formed which favors the center of the cell as the location with the greatest electric field. As such, size scaling and reliability of the non-volatile memory component are each increased.
    Type: Application
    Filed: November 6, 2015
    Publication date: May 11, 2017
    Inventors: Daniel BEDAU, Jeffrey Robinson CHILDRESS, Oleksandr MOSENDZ, John C. READ, Derek STEWART
  • Patent number: 9558777
    Abstract: According to one embodiment, a magnetic recording medium includes: a substrate, a seed layer positioned above the substrate, and a magnetic recording layer structure positioned above the seed layer. The magnetic recording layer structure includes: a first magnetic recording layer having a plurality of FePtCu magnetic grains and a first segregant, and a second magnetic recording layer positioned above the first magnetic recording layer, the second magnetic recording layer having a plurality of FePt magnetic grains and a second segregant, where a Curie temperature of the first magnetic recording layer is lower than a Curie temperature of the second magnetic recording layer.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: January 31, 2017
    Assignee: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Shikha Jain, Oleksandr Mosendz, Hans J. Richter, Dieter K. Weller
  • Patent number: 9472228
    Abstract: A magnetic medium for perpendicular magnetic data recording having improved corrosion characteristics and reduced surface roughness. The magnetic medium includes an under-layer and a perpendicular magnetic recording layer formed over the under-layer. The under-layer can be formed of MgO and has an oxygen concentration that is greater at the perpendicular magnetic recording layer than it is away from the perpendicular magnetic recording layer.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: October 18, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Akemi Hirotsune, Ikuko Takekuma, Hiroyuki Matsumoto, Oleksandr Mosendz
  • Patent number: 9443545
    Abstract: According to one embodiment, a magnetic medium includes a plasmonic underlayer having an Au alloy, where the Au alloy includes one or more alloying components that are substantially immiscible in Au; and a magnetic recording layer above the plasmonic underlayer. According to another embodiment, a magnetic medium, includes a multilayered plasmonic underlayer; and a magnetic recording layer above the multilayered plasmonic underlayer.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: September 13, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Oleksandr Mosendz, Vijay P. S. Rawat, Dieter K. Weller
  • Patent number: 9361926
    Abstract: A method for etching a media is disclosed. A first magnetic layer comprising grains is deposited with a segregant such that a portion of the first segregant covers a top surface of the grains of the first magnetic layer and a second portion of the first segregant separates the grains of the first magnetic layer. The first segregant is etched to remove the portion of the first segregant that covers the top surface of the grains.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: June 7, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Qing Dai, Oleksandr Mosendz, Simone Pisana, James Reiner, Hans Richter, Franck Rose, Dieter Weller
  • Publication number: 20160148632
    Abstract: According to one embodiment, a magnetic recording medium includes: a substrate, a seed layer positioned above the substrate, and a magnetic recording layer structure positioned above the seed layer. The magnetic recording layer structure includes: a first magnetic recording layer having a plurality of FePtCu magnetic grains and a first segregant, and a second magnetic recording layer positioned above the first magnetic recording layer, the second magnetic recording layer having a plurality of FePt magnetic grains and a second segregant, where a Curie temperature of the first magnetic recording layer is lower than a Curie temperature of the second magnetic recording layer.
    Type: Application
    Filed: November 26, 2014
    Publication date: May 26, 2016
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Olav Hellwig, Shikha Jain, Oleksandr Mosendz, Hans J. Richter, Dieter K. Weller
  • Patent number: 9324353
    Abstract: In one embodiment, a magnetic media suitable for HAMR recording includes a recording layer having first and second magnetic layers. The first magnetic layer has a first segregant between magnetic grains thereof, the first segregant being primarily C. Moreover, the second magnetic layer is formed above the first magnetic layer. The second magnetic layer has a second segregant between magnetic grains thereof, the second segregant being primarily C and a second component. Additional systems and methods are also described herein.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: April 26, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Oleksandr Mosendz, Simone Pisana, Dieter K. Weller
  • Publication number: 20160099017
    Abstract: According to one embodiment, a magnetic recording medium includes a substrate, and a magnetic recording layer structure positioned above the substrate, the magnetic recording layer structure including: a first magnetic recording layer having a first plurality of magnetic grains surrounded by a first segregant; a second magnetic recording layer positioned above the first magnetic recording layer, the second magnetic recording layer having a second plurality of magnetic grains surrounded by a second segregant; and a third magnetic recording layer positioned above the second magnetic recording layer, the third magnetic recording layer having a third plurality of magnetic grains surrounded by a third segregant, where at least the first segregant is primarily a combination of carbon and a second component, and where the second segregant is primarily carbon.
    Type: Application
    Filed: October 2, 2014
    Publication date: April 7, 2016
    Inventors: Olav Hellwig, Oleksandr Mosendz, Dieter K. Weller
  • Patent number: 9280996
    Abstract: An “all optical switching” (AOS) magnetic recording system, i.e., one that does not require a magnetic field to reverse the magnetization in the magnetic recording media, uses a FeMnPt L10 alloy as the magnetic media. A FeMnPt alloy, with appropriate amounts of Mn, will have high magneto-crystalline anisotropy, but also ferrimagnetic spin alignment for triggering AOS. The combination of high magneto-crystalline anisotropy and ferrimagnetic spin configuration enables the FeMnPt media to function as magnetic media whose magnetization can be switched solely by polarized laser pulses. The FeMnPt media for may be a single layer with or without any segregants. Alternatively, the FeMnPt media may be a multilayered recording layer comprising alternating layers of FePt and MnPt L10 ordered alloys. The segregant-free embodiments of the FeMnPt material may be patterned to form bit-patterned-media (BPM).
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: March 8, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Oleksandr Mosendz, Dieter K. Weller
  • Publication number: 20150179204
    Abstract: According to one embodiment, a magnetic medium includes a plasmonic underlayer having an Au alloy, where the Au alloy includes one or more alloying components that are substantially immiscible in Au; and a magnetic recording layer above the plasmonic underlayer. According to another embodiment, a magnetic medium, includes a multilayered plasmonic underlayer; and a magnetic recording layer above the multilayered plasmonic underlayer.
    Type: Application
    Filed: December 24, 2013
    Publication date: June 25, 2015
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Oleksandr Mosendz, Vijay P.S. Rawat, Dieter K. Weller
  • Publication number: 20150170696
    Abstract: An “all optical switching” (AOS) magnetic recording system, i.e., one that does not require a magnetic field to reverse the magnetization in the magnetic recording media, uses a FeMnPt L10 alloy as the magnetic media. A FeMnPt alloy, with appropriate amounts of Mn, will have high magneto-crystalline anisotropy, but also ferrimagnetic spin alignment for triggering AOS. The combination of high magneto-crystalline anisotropy and ferrimagnetic spin configuration enables the FeMnPt media to function as magnetic media whose magnetization can be switched solely by polarized laser pulses. The FeMnPt media for may be a single layer with or without any segregants. Alternatively, the FeMnPt media may be a multilayered recording layer comprising alternating layers of FePt and MnPt L10 ordered alloys. The segregant-free embodiments of the FeMnPt material may be patterned to form bit-patterned-media (BPM).
    Type: Application
    Filed: December 13, 2013
    Publication date: June 18, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Oleksandr Mosendz, Dieter K. Weller
  • Publication number: 20150138939
    Abstract: In one embodiment, a magnetic media suitable for HAMR recording includes a recording layer having first and second magnetic layers. The first magnetic layer has a first segregant between magnetic grains thereof, the first segregant being primarily C. Moreover, the second magnetic layer is formed above the first magnetic layer. The second magnetic layer has a second segregant between magnetic grains thereof, the second segregant being primarily C and a second component. Additional systems and methods are also described herein.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 21, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Oleksandr Mosendz, Simone Pisana, Dieter K. Weller
  • Publication number: 20140355156
    Abstract: A magnetic medium for perpendicular magnetic data recording having improved corrosion characteristics and reduced surface roughness. The magnetic medium includes an under-layer and a perpendicular magnetic recording layer formed over the under-layer. The under-layer can be formed of MgO and has an oxygen concentration that is greater at the perpendicular magnetic recording layer than it is away from the perpendicular magnetic recording layer.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 4, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Akemi Hirotsune, Ikuko Takekuma, Hiroyuki Matsumoto, Oleksandr Mosendz
  • Publication number: 20140332496
    Abstract: A method for etching a media is disclosed. A first magnetic layer comprising grains is deposited with a segregant such that a portion of the first segregant covers a top surface of the grains of the first magnetic layer and a second portion of the first segregant separates the grains of the first magnetic layer. The first segregant is etched to remove the portion of the first segregant that covers the top surface of the grains.
    Type: Application
    Filed: May 10, 2013
    Publication date: November 13, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Qing Dai, Oleksandr Mosendz, Simone Pisana, James Reiner, Hans Richter, Franck Rose, Dieter Weller
  • Patent number: 8721903
    Abstract: A vacuum planarization method substantially improves the surface roughness of a thermally-assisted recording (TAR) disk that has a recording layer (RL) formed of a substantially chemically-ordered FePt alloy or FePt-X alloy (or CoPt alloy or CoPt-X alloy) and a segregant, like SiO2. A first amorphous carbon overcoat (OC1) is deposited on the RL and etched with a non-chemically reactive plasma to remove at least one-half the thickness of OC1. Then a second amorphous carbon overcoat (OC2) is deposited on the etched OC1. The OC2 is then reactive-ion-etched, for example in a H2/Ar plasma, to remove at least one-half the thickness of OC2. A thin third overcoat (OC3) may be deposited on the etched OC2.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: May 13, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Xiaoping Bian, Qing Dai, Oleksandr Mosendz, Franck Dreyfus Rose, Run-Han Wang
  • Publication number: 20140014616
    Abstract: A method of making a thermally-assisted recording (TAR) disk includes etching an initial layer of generally spherically shaped FePt grains encapsulated by shells of graphitic carbon layers. The etching partially or completely removes the carbon layers on the tops of the shells, exposing the FePt grains while leaving carbon segregant material between the FePt grains. Additional Fe, Pt and C are then simultaneously deposited. The additional Fe and Pt grow on the exposed FePt grains and increase the vertical height of the grains, resulting in growth of columnar FePt grains. The additional C forms on top of the grains that together with the intergranular carbon form larger carbon shells. The resulting FePt grains thus have a generally columnar shape with perpendicular magnetic anisotropy, rather than a generally spherical shape. Lateral grain isolation is maintained by the carbon segregant remaining between the grains.
    Type: Application
    Filed: July 15, 2012
    Publication date: January 16, 2014
    Inventors: Oleksandr Mosendz, Simone Pisana, James William Reiner, Franck Dreyfus Rose
  • Patent number: 8630060
    Abstract: A heat enabled magnetic media having a composite magnetic recording layer structure that includes first and second magnetic layers and an exchange coupling layer sandwiched between the first and second magnetic layers. The exchange coupling layer has a reduced Curie temperature that allows the magnetic layers to become decoupled a lower temperature. This reduced Curie temperature can be achieved the addition of an alloying element such as Ni or Cu into the exchange coupling layer. Therefore, the exchange coupling layer can be constructed of an alloy such as FePtNi FePtCu, and the magnetic layers can be constructed of a material such as FePt.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: January 14, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Oleksandr Mosendz, Hans J. Richter
  • Patent number: 8623670
    Abstract: A method of making a thermally-assisted recording (TAR) disk includes etching an initial layer of generally spherically shaped FePt grains encapsulated by shells of graphitic carbon layers. The etching partially or completely removes the carbon layers on the tops of the shells, exposing the FePt grains while leaving carbon segregant material between the FePt grains. Additional Fe, Pt and C are then simultaneously deposited. The additional Fe and Pt grow on the exposed FePt grains and increase the vertical height of the grains, resulting in growth of columnar FePt grains. The additional C forms on top of the grains that together with the intergranular carbon form larger carbon shells. The resulting FePt grains thus have a generally columnar shape with perpendicular magnetic anisotropy, rather than a generally spherical shape. Lateral grain isolation is maintained by the carbon segregant remaining between the grains.
    Type: Grant
    Filed: July 15, 2012
    Date of Patent: January 7, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Oleksandr Mosendz, Simone Pisana, James William Reiner, Franck Dreyfus Rose