A Frequency-Controlled Magnetic Vortex Memory

By B. Pigeau, G. D. Loubens, O. Klein, A. Riegler, F. Lochner, G. Schmidt, L. Molenkamp, V. Tiberkevich, A. Slavin. 2010

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Using the ultra low damping NiMnSb half-Heusler alloy patterned into vortex-state magnetic nano-dots, we demonstrate a new concept of non-volatile memory controlled by the frequency. A perpendicular bias magnetic field is used to split the frequency of the vortex core gyrotropic rotation into two distinct frequencies, depending on the sign of the vortex core polarity $p=\pm1$ inside the dot. A magnetic resonance force microscope and microwave pulses applied at one of these two resonant frequencies allow for local and deterministic addressing of binary information (core polarity).

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/191cd1f560910e64fd9cf3fb6010f0f59289f9a4