The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Gang Xiao - One of the best experts on this subject based on the ideXlab platform.

  • Uniaxial anisotropy and switching behavior in epitaxial CrO2 films
    Applied Physics Letters, 2000
    Co-Authors: Fengyuan Yang, E. F. Ferrari, Gang Xiao, C. L. Chien, Xuesong Li, Akhil Gupta
    Abstract:

    Epitaxial a-axis oriented CrO2 films with a strong in-plane uniaxial anisotropy exhibit easy-axis switching at small fields and Coherent Rotation of magnetization at larger fields. Unique angular dependence of |cos φ| and |sec φ| have been observed for remanence and switching field, respectively.

  • Uniaxial anisotropy and switching behavior in epitaxial CrO 2 films
    Applied Physics Letters, 2000
    Co-Authors: F. Y. Yang, E. F. Ferrari, X. W. Li, Gang Xiao, C. L. Chien, Akhil Gupta
    Abstract:

    Epitaxial a-axis oriented CrO 2 films with a strong in-plane uniaxial anisotropy exhibit easy-axis switching at small fields and Coherent Rotation of magnetization at larger fields. Unique angular dependence of |cos φ\ and |sec φ| have been observed for remanence and switching field, respectively. © 2000 American Institute of Physics.

  • Probing magnetic anisotropy effects in epitaxial CrO 2 thin films
    Physical Review B - Condensed Matter and Materials Physics, 2000
    Co-Authors: Leonard Spinu, X. W. Li, Akhil Gupta, Hariharan Srikanth, Gang Xiao
    Abstract:

    The magnetic anisotropy in ferromagnetic chromium dioxide thin films (T c ∼393 K) grown epitaxially on (100) TiO 2 substrates, is probed using precise rf transverse susceptibility ( χT ) measurements. Singular peaks in χT are observed that are associated with the anisotropy (±H K ) and switching (±H s ) fields in CrO 2 . Theoretical calculations of χT based on a simple Coherent Rotation model display remarkable agreement with the experimental data, indicating that these thin films behave like single-domain magnetic particles. Magneto-elastic contributions to the total anisotropy energy are needed to describe the evolution of χT peaks at lower temperatures.

Akhil Gupta - One of the best experts on this subject based on the ideXlab platform.

  • Uniaxial anisotropy and switching behavior in epitaxial CrO2 films
    Applied Physics Letters, 2000
    Co-Authors: Fengyuan Yang, E. F. Ferrari, Gang Xiao, C. L. Chien, Xuesong Li, Akhil Gupta
    Abstract:

    Epitaxial a-axis oriented CrO2 films with a strong in-plane uniaxial anisotropy exhibit easy-axis switching at small fields and Coherent Rotation of magnetization at larger fields. Unique angular dependence of |cos φ| and |sec φ| have been observed for remanence and switching field, respectively.

  • Uniaxial anisotropy and switching behavior in epitaxial CrO 2 films
    Applied Physics Letters, 2000
    Co-Authors: F. Y. Yang, E. F. Ferrari, X. W. Li, Gang Xiao, C. L. Chien, Akhil Gupta
    Abstract:

    Epitaxial a-axis oriented CrO 2 films with a strong in-plane uniaxial anisotropy exhibit easy-axis switching at small fields and Coherent Rotation of magnetization at larger fields. Unique angular dependence of |cos φ\ and |sec φ| have been observed for remanence and switching field, respectively. © 2000 American Institute of Physics.

  • Probing magnetic anisotropy effects in epitaxial CrO 2 thin films
    Physical Review B - Condensed Matter and Materials Physics, 2000
    Co-Authors: Leonard Spinu, X. W. Li, Akhil Gupta, Hariharan Srikanth, Gang Xiao
    Abstract:

    The magnetic anisotropy in ferromagnetic chromium dioxide thin films (T c ∼393 K) grown epitaxially on (100) TiO 2 substrates, is probed using precise rf transverse susceptibility ( χT ) measurements. Singular peaks in χT are observed that are associated with the anisotropy (±H K ) and switching (±H s ) fields in CrO 2 . Theoretical calculations of χT based on a simple Coherent Rotation model display remarkable agreement with the experimental data, indicating that these thin films behave like single-domain magnetic particles. Magneto-elastic contributions to the total anisotropy energy are needed to describe the evolution of χT peaks at lower temperatures.

X. W. Li - One of the best experts on this subject based on the ideXlab platform.

  • Uniaxial anisotropy and switching behavior in epitaxial CrO 2 films
    Applied Physics Letters, 2000
    Co-Authors: F. Y. Yang, E. F. Ferrari, X. W. Li, Gang Xiao, C. L. Chien, Akhil Gupta
    Abstract:

    Epitaxial a-axis oriented CrO 2 films with a strong in-plane uniaxial anisotropy exhibit easy-axis switching at small fields and Coherent Rotation of magnetization at larger fields. Unique angular dependence of |cos φ\ and |sec φ| have been observed for remanence and switching field, respectively. © 2000 American Institute of Physics.

  • Probing magnetic anisotropy effects in epitaxial CrO 2 thin films
    Physical Review B - Condensed Matter and Materials Physics, 2000
    Co-Authors: Leonard Spinu, X. W. Li, Akhil Gupta, Hariharan Srikanth, Gang Xiao
    Abstract:

    The magnetic anisotropy in ferromagnetic chromium dioxide thin films (T c ∼393 K) grown epitaxially on (100) TiO 2 substrates, is probed using precise rf transverse susceptibility ( χT ) measurements. Singular peaks in χT are observed that are associated with the anisotropy (±H K ) and switching (±H s ) fields in CrO 2 . Theoretical calculations of χT based on a simple Coherent Rotation model display remarkable agreement with the experimental data, indicating that these thin films behave like single-domain magnetic particles. Magneto-elastic contributions to the total anisotropy energy are needed to describe the evolution of χT peaks at lower temperatures.

I. Klik - One of the best experts on this subject based on the ideXlab platform.

  • eigenvalue spectrum of brown s fokker planck equation for Coherent Rotation of magnetization
    Journal of Magnetism and Magnetic Materials, 1998
    Co-Authors: I. Klik
    Abstract:

    Abstract The eigenvalues of Brown's Fokker–Planck operator for Coherent Rotation of magnetization are computed for a bistable, axially symmetric system and their dependence on temperature and bias strength is studied. At zero bias the spectrum consists of alternating eigenvalue singlets and near triplets which split upon introduction of a small biasing field. Eigenvalue crossing sets in at a larger field bias and is found to be present also in an asymmetric single well eventhough it is absent from a symmetric single well. The possible origin of the eigenvalue crossing and the thermal relaxation rate are discussed.

  • Eigenvalue spectrum of Brown's Fokker–Planck equation for Coherent Rotation of magnetization
    Journal of Magnetism and Magnetic Materials, 1998
    Co-Authors: I. Klik
    Abstract:

    Abstract The eigenvalues of Brown's Fokker–Planck operator for Coherent Rotation of magnetization are computed for a bistable, axially symmetric system and their dependence on temperature and bias strength is studied. At zero bias the spectrum consists of alternating eigenvalue singlets and near triplets which split upon introduction of a small biasing field. Eigenvalue crossing sets in at a larger field bias and is found to be present also in an asymmetric single well eventhough it is absent from a symmetric single well. The possible origin of the eigenvalue crossing and the thermal relaxation rate are discussed.

Holger Schmidt - One of the best experts on this subject based on the ideXlab platform.

  • magnetization reversal by Coherent Rotation in single domain magnets with arbitrary anisotropy
    Journal of Applied Physics, 2003
    Co-Authors: Holger Schmidt
    Abstract:

    We present an exact treatment of magnetization reversal by Coherent Rotation in single-domain magnets with multiple crystal anisotropy axes. External switching field values can be determined for arbitrary relative orientations of crystal axes, external fields, and additional anisotropy axes (e.g., shape anisotropy) without any simplifying assumptions or approximations. The method is applied to analyze Coherent Rotation in particles with cubic crystal anisotropy. We find that the switching field is to first order determined by the closest crystal anisotropy axis, but influence from the next nearest axis leads to non-negligible corrections on the order of tens of percent of the switching field. We also demonstrate that during reversal the magnetization vector rotates predominantly in a single, well-defined plane with only minor deviations. The ramifications for control of the switching field values in single-domain nanomagnets are discussed.