Patents by Inventor Roy W. Chantrell

Roy W. Chantrell 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).

  • Method and apparatus for determining Curie temperature distribution of a sample of magnetic material
    Patent number: 10006884
    Abstract: Determining a Curie temperature (Tc) distribution of a sample comprising magnetic material involves subjecting the sample to an electromagnetic field, heating the sample over a range of temperatures, generating a signal representative of a parameter of the sample that changes as a function of changing sample temperature while the sample is subjected to the electromagnetic field, and determining the Tc distribution of the sample using the generated signal and a multiplicity of predetermined parameters of the sample.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: June 26, 2018
    Assignee: Seagate Technology LLC
    Inventors: Ganping Ju, Jason L Presseky, Roy W. Chantrell, Xiaowei Wu, Xi Chen, Xiaobin Zhu, Yingguo Peng
  • Complex transverse AC magneto-optic susceptometer for determination of volume and anisotropy field distribution in recording media
    Patent number: 7166997
    Abstract: A method and apparatus for determining volume and anisotropy field distribution of thin film granular material includes the use of a magneto-optic probe, a lock-in amplifier, and a computer. The magneto-optic probe utilizes the Kerr effect in order to determine the transverse AC susceptibility of the sample. The Lock-in amplifier determines the complex parameters of the susceptibility as a function of the DC field and AC frequency. Separate distribution values of anisotropy field and grain volume can then be determined mathematically from the relationship of complex susceptibility parameters to the DC field strength.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: January 23, 2007
    Assignee: Seagate Technology LLC
    Inventors: Ganping Ju, Roy W. Chantrell, Hong Zhou, Dieter K. Weller
  • Complex transverse AC magneto-optic susceptometer for determination of volume and anisotropy field distribution in recording media
    Publication number: 20040066190
    Abstract: A method and apparatus for determining volume and anisotropy field distribution of thin film granular material includes the use of a magneto-optic probe, a lock-in amplifier, and a computer. The magneto-optic probe utilizes the Kerr effect in order to determine the transverse AC susceptibility of the sample. The Lock-in amplifier determines the complex parameters of the susceptibility as a function of the DC field and AC frequency. Separate distribution values of anisotropy field and grain volume can then be determined mathematically from the relationship of complex susceptibility parameters to the DC field strength.
    Type: Application
    Filed: October 6, 2003
    Publication date: April 8, 2004
    Inventors: Ganping Ju, Roy W. Chantrell, Hong Zhou, Dieter K. Weller