Temperature dependence of the magnetization reversal of thin-film longitudinal magnetic recording media

    Authors

    K. R. Coffey; J. U. Thiele;T. Thomson

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    IEEE Trans. Magn.

    Keywords

    activation volume; longitudinal recording media; magnetic switching; switching volume; thermal stability; SWITCHING FIELD; Engineering, Electrical & Electronic; Physics, Applied

    Abstract

    As longitudinal magnetic recording media approach the superparamagnetic limit, temperature-dependent effects are becoming ever more important. This work reports an unexpected temperature dependence for the Sharrock stability parameter S typically given as KuV/k(B)T, where K-u is the unixial anisotropy, V the switching volume, k(B) is Boltzmann's constant, and T the temperature. Temperature-dependent vibrating sample magnetometer measurements were made of the saturation and remanent magnetization M-s and M-r, remanent coercivity H-cr, and K-u. The Sharrock equation was used to calculate S, and the time-independent switching field H-o of representative longitudinal recording media. Instead of the product Sk(B)T decreasing proportionally to K-u or H-o with increasing temperature as initially expected, we find Sk(B)T decreases at approximately half this rate.

    Journal Title

    Ieee Transactions on Magnetics

    Volume

    40

    Issue/Number

    4

    Publication Date

    1-1-2004

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    2440

    Last Page

    2442

    WOS Identifier

    WOS:000223446700149

    ISSN

    0018-9464

    Share

    COinS