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Robert D Mcmichael - One of the best experts on this subject based on the ideXlab platform.

  • demagnetized state dependence of Henkel plots i the preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • Demagnetized‐state dependence of Henkel plots. I. The Preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • demagnetized state dependence of Henkel plots ii domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

  • Demagnetized‐state dependence of Henkel plots. II. Domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

Edward Della Torre - One of the best experts on this subject based on the ideXlab platform.

  • demagnetized state dependence of Henkel plots i the preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • Demagnetized‐state dependence of Henkel plots. I. The Preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • demagnetized state dependence of Henkel plots ii domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

  • Demagnetized‐state dependence of Henkel plots. II. Domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

F. Vajda - One of the best experts on this subject based on the ideXlab platform.

  • demagnetized state dependence of Henkel plots i the preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • Demagnetized‐state dependence of Henkel plots. I. The Preisach model
    Journal of Applied Physics, 1994
    Co-Authors: F. Vajda, Edward Della Torre, Robert D Mcmichael
    Abstract:

    The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

  • demagnetized state dependence of Henkel plots ii domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

  • Demagnetized‐state dependence of Henkel plots. II. Domain wall motion
    Journal of Applied Physics, 1994
    Co-Authors: Robert D Mcmichael, F. Vajda, Edward Della Torre
    Abstract:

    The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.

E.d. Dahlberg - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Demagnetization Method on Remnance Magnetization States in Metallic Ferromagnets
    IEEE Transactions on Magnetics, 2020
    Co-Authors: Jennifer Freedberg, E.d. Dahlberg
    Abstract:

    Parametric plots of the remagnetization versus demagnetization remnances were found for four metallic ferromagnets -- nickel wire, two types of AlNiCo, and samarium cobalt 2:17. These plots, known as Henkel plots, were compared to Wohlfarth's model for noninteracting magnetic particles and several Preisach models. The remagnetization data were taken with a variety of paths to the net zero magnetization state. The resulting Henkel plots exhibit similarities to independent Monte Carlo simulations. The differences can be mostly explained by considering that the magnetization in the metallic ferromagnets occur by domain wall motion.

  • Henkel plots in a temperature and time dependent preisach model
    IEEE Transactions on Magnetics, 1996
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E E Wesseling, R.m. Roshko
    Abstract:

    The effect of finite temperature T and observation time t on the Henkel plots of ac and thermally demagnetized systems has been investigated within the framework of a generalized Preisach model, in which it is assumed that thermally activated hopping will occur over all energy barriers WHenkel plots, at least for ac demagnetized systems. An exception is a thermally demagnetized system with k=0, which has a linear Henkel plot independent of W*. Varying the effective time for thermal relaxation of the magnetization from branch to branch of the hysteresis cycle can have the effect of imitating mean field interactions of both magnetizing-like and demagnetizing-like sign in systems with k=0, and can even lead to Henkel plots which violate the lower boundary i/sub d/=-i/sub r/.

  • Henkel plots in a thermally demagnetized scalar Preisach model
    IEEE Transactions on Magnetics, 1995
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E. Engle, R.m. Roshko
    Abstract:

    The implications of thermal demagnetization with respect to the observation of interaction effects in Henkel plots are discussed within the framework of a scalar moving Preisach model. The Preisach distribution is assumed to be a product of a Gaussian coercive field distribution and a Gaussian interaction field distribution. Numerical calculations of the magnetizing and demagnetizing remanences show that, by contrast with other demagnetizing procedures, thermal demagnetization yields Henkel plots whose direction of curvature is uniquely related to the sign of the mean interaction field. In particular, a distribution of interaction fields which is symmetric about the origin yields the same linear Wohlfarth relation as a completely noninteracting system, while demagnetizing (magnetizing)-like mean fields always curve the Henkel plot below (above) the Wohlfarth line. The simple linearity of the Henkel plot in the absence of mean field effects was exploited to evaluate the effectiveness of a recent proposal for experimentally suppressing shape demagnetizing effects in perpendicular recording media.

  • Henkel Plots in a Thermally Demagnetized Scalar
    1995
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E. Engle, R.m. Roshko
    Abstract:

    The implications of thermal demagnetization with respect to the observation of interaction effects in Henkel plots are discussed within the framework of a scalar moving Preisach model. The Preisach distribution is assumed to be a product of a Gaussian coercive field distribution and a Gaussian interac- tion field distribution. Numerical calculations of the magnet- izing and demagnetizing remanences show that, by contrast with other demagnetizing procedures, thermal demagnetiza- tion yields Henkel plots whose direction of curvature is uniquely related to the sign of the mean interaction field. In particular, a distribution of interaction fields which is symmetric about the origin yields the same linear Wohlfarth relation as a completely noninteracting system, while demagnetizing (magnetizing)-like mean fields always curve the Henkel plot below (above) the Wohlfarth line. The simple linearity of the Henkel plot in the absence of mean field effects was exploited to evaluate the ef- fectiveness of a recent proposal for experimentally suppressing shape demagnetizing effects in perpendicular recording media.

R.m. Roshko - One of the best experts on this subject based on the ideXlab platform.

  • Henkel plots in a temperature and time dependent preisach model
    IEEE Transactions on Magnetics, 1996
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E E Wesseling, R.m. Roshko
    Abstract:

    The effect of finite temperature T and observation time t on the Henkel plots of ac and thermally demagnetized systems has been investigated within the framework of a generalized Preisach model, in which it is assumed that thermally activated hopping will occur over all energy barriers WHenkel plots, at least for ac demagnetized systems. An exception is a thermally demagnetized system with k=0, which has a linear Henkel plot independent of W*. Varying the effective time for thermal relaxation of the magnetization from branch to branch of the hysteresis cycle can have the effect of imitating mean field interactions of both magnetizing-like and demagnetizing-like sign in systems with k=0, and can even lead to Henkel plots which violate the lower boundary i/sub d/=-i/sub r/.

  • Henkel plots in a thermally demagnetized scalar Preisach model
    IEEE Transactions on Magnetics, 1995
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E. Engle, R.m. Roshko
    Abstract:

    The implications of thermal demagnetization with respect to the observation of interaction effects in Henkel plots are discussed within the framework of a scalar moving Preisach model. The Preisach distribution is assumed to be a product of a Gaussian coercive field distribution and a Gaussian interaction field distribution. Numerical calculations of the magnetizing and demagnetizing remanences show that, by contrast with other demagnetizing procedures, thermal demagnetization yields Henkel plots whose direction of curvature is uniquely related to the sign of the mean interaction field. In particular, a distribution of interaction fields which is symmetric about the origin yields the same linear Wohlfarth relation as a completely noninteracting system, while demagnetizing (magnetizing)-like mean fields always curve the Henkel plot below (above) the Wohlfarth line. The simple linearity of the Henkel plot in the absence of mean field effects was exploited to evaluate the effectiveness of a recent proposal for experimentally suppressing shape demagnetizing effects in perpendicular recording media.

  • Henkel Plots in a Thermally Demagnetized Scalar
    1995
    Co-Authors: P.d. Mitchler, E.d. Dahlberg, E. Engle, R.m. Roshko
    Abstract:

    The implications of thermal demagnetization with respect to the observation of interaction effects in Henkel plots are discussed within the framework of a scalar moving Preisach model. The Preisach distribution is assumed to be a product of a Gaussian coercive field distribution and a Gaussian interac- tion field distribution. Numerical calculations of the magnet- izing and demagnetizing remanences show that, by contrast with other demagnetizing procedures, thermal demagnetiza- tion yields Henkel plots whose direction of curvature is uniquely related to the sign of the mean interaction field. In particular, a distribution of interaction fields which is symmetric about the origin yields the same linear Wohlfarth relation as a completely noninteracting system, while demagnetizing (magnetizing)-like mean fields always curve the Henkel plot below (above) the Wohlfarth line. The simple linearity of the Henkel plot in the absence of mean field effects was exploited to evaluate the ef- fectiveness of a recent proposal for experimentally suppressing shape demagnetizing effects in perpendicular recording media.