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TT: Fachverband Tiefe Temperaturen

TT 87: Focus Session: Unconventional Spin Structures (organized by MA)

TT 87.3: Topical Talk

Donnerstag, 3. April 2014, 10:30–11:00, BEY 118

Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk — •Peter Fischer¹, Mi-Young Im¹, Keisuke Yamada², Tomonori Sato³, Shinya Kasai⁴, Yoshinobu Nakatani³, and Teruo Ono² — ¹CXRO, LBNL, Berkeley CA USA — ²Inst. f.Chem. Res., Kyoto University Japan — ³U of Electro-Comm., Chofu, Japan — ⁴Spintronics Group, Magn. Mat Center, NIMS, Tsukuba, Japan

Mesoscale phenomena will transform nanomagnetism research to the next level [1], as they add complexity and functionality, which are essential to meet future challenges of spin driven devices.

A priori, one would assume that the formation of magnetic vortex states should exhibit a perfect symmetry, because the magnetic vortex has four degenerate states. We report on the direct observation of an asymmetric phenomenon in the formation process of vortex states in a permalloy nanodisk by magnetic full field transmission soft x-ray microscopy [2]. Micromagnetic simulations confirm that an intrinsic Dzyaloshinskii*Moriya interaction is decisive for the asymmetric formation of vortex states.

Supported by the U.S. Department of Energy (# DE-AC02-05-CH11231) and by the Leading Foreign Research Institute Recruitment Program (# 2012K1A4A3053565) through the NRF of Korea funded by the Ministry of Education, Science and Technology.

[1] R. Service, Science 335 1167 (2012) [2] M.-Y. Im, P. Fischer, Y. Keisuke, T. Sato, S. Kasai, Y. Nakatani, T. Ono, Nature Communications 3 983 (2012)