Correlations of Modulation Noise with Magnetic Microstructure and Intergranular Interactions for CoCrTa and CoNi Thin Film Media

Published

January 1, 1991

Author(s)

Mahbub R. Khan, S Y. Lee, S L. Duan, J L. Pressesky, Neil Heiman, D E. Speliotis, M Scheinfein

Abstract

This paper reports on two thin-film media alloys Co₈₆Cr₁₂Ta₂ and Co₇₅Ni₂₅ which have very different noise characteristics. The magnetic microstructure of these films was observed with scanning electron microscopy with polarization analysis (SEMPA). The variance (ς) of the magnetization across the transition region was calculated. The origin of anisotropy was determined by measuring the temperature coefficients of H_c and M_s. The interaction strengths between grains, δM(H), were obtained from the measurements of the reverse demagnetization remanence Md(H) and the forward magnetization remanence M_d(H). We found that the CoNi film showed a greater degree of interparticle interaction, which may explain the observed cross-bit linkages in SEMPA image, larger rms transition variation (ς_t), and higher modulation noise.

Citation

Journal of Applied Physics

Volume

69

Issue

8

Pub Type

Journals

Citation

Khan, M. , Lee, S. , Duan, S. , Pressesky, J. , Heiman, N. , Speliotis, D. and Scheinfein, M. (1991), Correlations of Modulation Noise with Magnetic Microstructure and Intergranular Interactions for CoCrTa and CoNi Thin Film Media, Journal of Applied Physics (Accessed October 23, 2025)