Rotational Hysteresis of Exchange-Spring Magnets

Published

September 13, 2002

Author(s)

J.S. Jiang, S D. Bader, H Kaper, G Leaf, Robert D. Shull, Alexander J. Shapiro, V S. Gornakov, Valerian I. Nikitenko, C L. Platt, A. E. Berkowitz, S David, E E. Fullerton

Abstract

We highlight our experimental studies and micromagnetic simulations of the rotational hysteresis in exchange-spring magnets. Magneto-optical imaging and torque magnetometry measurements for SmCo/Fe exchange-spring films with uniaxial in-plane anisotropy show that the magnetization roattion created in the magnetically soft Fe layer by a rotating magnetic field is hysteretic. The rotational hysteresis is due to the reversal of the chirality of the spin sprial structure. Micromagnetic simulations reveal two reversal modes of the chirality, one at low fields due to an in-plane untwisting of the spiral, and the other, at high fields, due to an out-of-plane fanning of the spiral.

Proceedings Title

International Colloquium on Magnetic Thin Films and Surfaces | 17th | | IOP Publishing Ltd

Volume

35

Issue

No. 19

Conference Dates

March 1, 2002

Conference Location

Kyoto, 1, JA

Conference Title

Journal of Physics

Pub Type

Conferences

Keywords

exchange-spring magnets, magneto-optical imaging, rotational hysteresis, torque magnetometry measurements uniazia

Citation

Jiang, J. , Bader, S. , Kaper, H. , Leaf, G. , Shull, R. , Shapiro, A. , Gornakov, V. , Nikitenko, V. , Platt, C. , Berkowitz, A. , David, S. and Fullerton, E. (2002), Rotational Hysteresis of Exchange-Spring Magnets, International Colloquium on Magnetic Thin Films and Surfaces | 17th | | IOP Publishing Ltd, Kyoto, 1, JA (Accessed October 11, 2025)