Rotational hysteresis of exchange-spring magnets.

Conference · Wed Mar 27 00:00:00 EST 2002

DOI:https://doi.org/10.1088/0022-3727/35/19/303· OSTI ID:793873

Jiang, J S; Bader, S D; Kaper, H; Leaf, G K; Shull, R D; Shapiro, A J; Gornakov, V S; Nikitenko, V I; Platt, C L; Berkowitz, A E; David, S; Fullerton, E E

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.

• Research Organization: Argonne National Lab., IL (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 793873
• Report Number(s): ANL/MSD/CP-106637; TRN: US0201085
• Resource Relation: Journal Volume: 35; Journal Issue: 19; Conference: 17th International Colloquium on Magnetic Films and Surfaces (ICMFS 2002), Kyoto (JP), 03/05/2002--03/08/2002; Other Information: PBD: 27 Mar 2002
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
CHIRALITY
HYSTERESIS
MAGNETIC FIELDS
MAGNETIZATION
MAGNETS
ROTATION
SPIN
TORQUE