Rotational hysteresis of exchange-spring magnets.

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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 rotation 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 spiral 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.

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19 pages

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Jiang, J.S.; Bader, S.D.; Kaper, H.; Leaf, G.K.; Shull, R.D.; Shapiro, A.J. et al. March 27, 2002.

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Description

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 rotation 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 spiral 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.

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19 pages

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  • 17th International Colloquium on Magnetic Films and Surfaces (ICMFS 2002), Kyoto (JP), 03/05/2002--03/08/2002

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  • Report No.: ANL/MSD/CP-106637
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 793873
  • Archival Resource Key: ark:/67531/metadc740106

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  • March 27, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 23, 2016, 3:34 p.m.

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Jiang, J.S.; Bader, S.D.; Kaper, H.; Leaf, G.K.; Shull, R.D.; Shapiro, A.J. et al. Rotational hysteresis of exchange-spring magnets., article, March 27, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc740106/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.