Permalloy thin-film structure of micron-sized dimensions for stabilizing an isolated magnetic antivortex. To investigate the magnetization dynamics driven by spin-transfer torque, two crossed pairs of electrodes are used.

From the article:

Magnetic Antivortex-Core Reversal by Circular-Rotational Spin Currents
Thomas Kamionka, Michael Martens, Kang Wei Chou, Michael Curcic, André Drews, Gisela Schütz, Tolek Tyliszczak, Hermann Stoll, Bartel Van Waeyenberge, and Guido Meier
Phys. Rev. Lett. 105, 137204 (2010)

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