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Rotational Hysteresis of Exchange-Spring Magnets



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


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
No. 19
Conference Dates
March 1, 2002
Conference Location
Kyoto, 1, JA
Conference Title
Journal of Physics


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


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 May 24, 2024)


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Created September 12, 2002, Updated October 12, 2021