Patents by Inventor Dieter K. Weller

Dieter K. Weller 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: 10347281
    Abstract: Methods are disclosed for increasing areal density in Heat Assisted Magnetic Recording (HAMR) data storage systems by controlling the media layer grain size, grain size distribution, and pitch via templating techniques that are compatible with the high temperature HAMR media deposition. Embodiments include using current HAMR media seed layers as well as additionally introduced interlayers for the templating process. Topographic as well as chemical templating methods are disclosed that may employ nanoimprint technology or nanoparticle self-assembly among other patterning techniques.
    Type: Grant
    Filed: June 2, 2015
    Date of Patent: July 9, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Hitesh Arora, Bruce Gurney, Olav Hellwig, Jodi Mari Iwata, Tiffany Suzanne Santos, Dieter K. Weller, Frank Zhu
  • 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
  • Publication number: 20160358622
    Abstract: Methods are disclosed for increasing areal density in Heat Assisted Magnetic Recording (HAMR) data storage systems by controlling the media layer grain size, grain size distribution, and pitch via templating techniques that are compatible with the high temperature HAMR media deposition. Embodiments include using current HAMR media seed layers as well as additionally introduced interlayers for the templating process. Topographic as well as chemical templating methods are disclosed that may employ nanoimprint technology or nanoparticle self-assembly among other patterning techniques.
    Type: Application
    Filed: June 2, 2015
    Publication date: December 8, 2016
    Inventors: Hitesh Arora, Bruce GURNEY, Olav HELLWIG, Jodi Mari IWATA, Tiffany Suzanne SANTOS, Dieter K. WELLER, Frank ZHU
  • 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
  • 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
  • Patent number: 9311948
    Abstract: A perpendicular magnetic recording layer of a magnetic recording medium includes a plurality of bit-patterned magnetic islands, wherein each of the plurality of islands overlay a soft magnetic under-layer. Each of the magnetic islands includes a first magnetic sub-layer adjacent a second magnetic sub-layer, wherein the first sub-layer has a relatively high magnetic anisotropy that is greater than a magnetic anisotropy of the second sub-layer. The magnetic recording layer further includes a third sub-layer, which extends to connect each of the plurality of islands. The third sub-layer may have a magnetic anisotropy that is less than that of the second sub-layer of each of the magnetic islands and/or may serve as an interlayer, extending between the first sub-layer and the soft magnetic under-layer of the recording medium, and having a structure to help to produce the greater anisotropy first magnetic sub-layer.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: April 12, 2016
    Assignee: Seagate Technology LLC
    Inventors: Erol Girt, Dieter K. Weller, Alexander Y. Dobin, Bogdan F. Valcu, Thomas F. Ambrose, Yingguo Peng, Yukiko A. Kubota, Abebe Hailu
  • 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
  • Patent number: 9183865
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: November 10, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • Publication number: 20150302878
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 22, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • Patent number: 9147423
    Abstract: A method for making a bit-patterned-media magnetic recording disk with discrete magnetic islands includes annealing the data islands after they have been formed by an etching process. A hard mask, such as a layer of silicon nitride or carbon, may be first formed on the recording layer and a patterned resist formed on the hard mask. The resist pattern is then transferred into the hard mask, which is used as the etch mask to etch the recording layer and form the discrete data islands. After the data islands are formed by the etching process, the patterned recording layer is annealed. The annealing may be done in a vacuum, or in an inert gas, like helium or argon, or in a forming gas such as a reducing atmosphere of argon plus hydrogen. The annealing improves the coercivity, the effective saturation magnetization and the thermal stability of the patterned media.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: September 29, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Michael Konrad Grobis, Olav Hellwig, Ernesto E. Marinero, Andrew Thomas McCallum, 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
  • Patent number: 9040180
    Abstract: A perpendicular magnetic recording disk has a graded-anisotropy recording layer (RL) formed of at least two ferromagnetically exchange coupled CoPtCr-oxide magnetic layers (MAG1 and MAG2) with two nucleation films (NF1 and NF2) between the magnetic layers. NF1 is a metal film, preferably Ru or a Ru-based alloy like RuCr, sputter deposited on MAG1 at low pressure to a thickness between about 0.1-1.5 nm. NF2 is a metal oxide film, preferably an oxide of Ta, sputter deposited on NF1 at high pressure to a thickness between about 0.2-1.0 nm. MAG2 is sputter deposited over NF2. NF1 and NF2 provide a significant reduction in average grain size in the RL from a graded-anisotropy RL without nucleation films between MAG1 and MAG2, while also assuring that MAG1 and MAG2 are strongly exchange coupled.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: May 26, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Ernesto E. Marinero, Dieter K. Weller, Brian R. York
  • 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
  • Patent number: 8900655
    Abstract: A method of fabricating a patterned perpendicular magnetic recording medium comprises steps of: (a) providing a layer stack including a magnetically soft underlayer (“SUL”) and an overlying non-magnetic interlayer; (b) forming a masking layer on the non-magnetic interlayer; (c) forming a resist layer on the masking layer; (d) forming a pattern of recesses extending through the resist layer and exposing spaced apart surface portions of the masking layer; (e) extending the pattern of recesses through the masking layer to expose spaced apart surface portions of the interlayer; and (f) at least partially filling the pattern of recesses with a magnetically hard material to form a perpendicular magnetic recording layer.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: December 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Bing K. Yen, David S. Kuo, Dieter K. Weller, Kim Y. Lee, Koichi Wago
  • Publication number: 20140287268
    Abstract: Provided herein is an apparatus, including a plurality of spaced apart perpendicular magnetic elements. Each of the magnetic elements includes a respective discrete magnetic domain and each of the magnetic elements includes a magnetic recording layer comprising a Co1-x-yPtxCry alloy material, where 0.05?x?0.35 and 0?y?0.15.
    Type: Application
    Filed: February 12, 2014
    Publication date: September 25, 2014
    Applicant: Seagate Technology LLC
    Inventors: Dieter K. Weller, Hans J. Richter, Samuel D. Harkness, IV, Erol Girt
  • Publication number: 20140193538
    Abstract: Provided herein is an apparatus, including an imprint template including a dual-imprint pattern, wherein the dual-imprint pattern is characteristic of imprinting a first pattern on the template with a first template and a second pattern on the template with a second template, and wherein the first pattern and the second pattern at least partially overlap to form the dual-imprint pattern.
    Type: Application
    Filed: January 21, 2014
    Publication date: July 10, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Kim Y. Lee, Bing K. Yen, David S. Kuo, Koichi Wago, Shih-fu Lee, Dieter K. Weller
  • Patent number: 8673466
    Abstract: A bit patterned magnetic recording medium comprises a substrate having a surface, and a plurality of spaced apart magnetic elements on the surface, each element constituting a discrete magnetic domain or bit of the same structure and comprised of a stack of thin film layers including in order from the substrate surface: a seed layer; and a perpendicular magnetic recording layer in contact with a surface of the seed layer and comprising a Co 1-x-yPtxCry alloy material, where 0.05?x?0.35 and 0?y?0.15. The Co1-x-yPtxCry alloy material has a first order magnetic anisotropy constant K1 up to about 2×107 erg/cm3, a saturation magnetization Ms up to about 1200 emu/cm3, an anisotropy field HK=2K1/Ms up to about 35 kOe, a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof, and an X-Ray diffraction (XRD) rocking curve with a full width at half maximum (FWHM) of ˜5° or less.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: March 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dieter K. Weller, Hans J. Richter, Samuel D. Harkness, IV, Erol Girt