Theoretical study on stress-induced demagnetization in magnetic recording media

Izawa, Fumio

doi:10.1109/tmag.1984.1063128

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“…As a consequence, the energy of applied loads becomes another source of magnetic anisotropy energy while the magnetostrictive self-energy vanishes. The intrinsic stress resulting from incompatible magnetostrictive strain as magnetization rotates is not taken into account while the external stress causes the induction of a magnetostrictive uniaxial anisotropy, usually called stress-induced anisotropy (Izawa, 1984;Jeong and Bogy, 1995). The material is then treated as a rigid ferromagnetics with varying magnetic easy axes depending on external stress.…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic modeling of magnetostrictive materials under intrinsic stress

Shu

Lin

2004

Mechanics of Materials

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Section: Introductionmentioning

confidence: 99%

Micromagnetic modeling of magnetostrictive materials under intrinsic stress

Shu

Lin

2004

Mechanics of Materials

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Self-consistent calculation of stress-induced demagnetization process

Izawa

1985

Journal of Applied Physics

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The change in a magnetization transition zone in a magnetic recording medium is analyzed under stress application by the self-consistent iterative calculation method. The medium is assumed to be composed of uniaxial single domain magnetic particles with two-dimensional angular distribution of easy axes. Owing to the applied stress, the demagnetizing field temporarily increases at the localized area, because the magnetization distribution changes due to stress-induced easy axes rotation. The applied stress also changes the critical field for irreversible magnetization switching; hence, additional magnetization reversal takes place for particles which suffer critically large demagnetizing field. Consequently, the present simulation can explain the stress-induced demagnetization phenomenon, in which reproduced signal level attenuates as a result of magnetization transition broadening caused by stress.

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