A Frequency-Controlled Magnetic Vortex Memory

B. Pigeau (1) , G. de Loubens (1) , O. Klein (1) , A. Riegler (2) , F. Lochner (2) , G. Schmidt (2) , L.W. Molenkamp (2) , V. S. Tiberkevich (3) , A. N. Slavin (3)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 EP3 - Experimentelle Physik III [Würzburg]
3 Department of Physics [Rochester]

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).

Mots clés: magnetic vortex; magnetic resonance; magnetic resonance force microscopy; MRFM; resonant reversal

Domaines: Science des matériaux [cond-mat.mtrl-sci]

B. Pigeau, G. de Loubens, O. Klein, A. Riegler, F. Lochner, et al.. A Frequency-Controlled Magnetic Vortex Memory. Applied Physics Letters, 2010, 96 (13), pp.132506. ⟨10.1063/1.3373833⟩. ⟨hal-00458967⟩