Publication Date:
2017-08-12
Description:
Author(s): Manu Sushruth, Jasper P. Fried, Abdelmadjid Anane, Stephane Xavier, Cyrile Deranlot, Vincent Cros, and Peter J. Metaxas The gyrotropic resonance frequency of a magnetic vortex, widely studied for applications in data storage and radio-frequency signal processing, increases with the vortex core’s stiffness. In traditional disk-shaped elements, this stiffness increases if the core is shifted towards the element’s edges. Here, the authors show that introducing a flat edge into a disk locally de-stiffens the core, resulting in the resonant frequency strongly decreasing when the core approaches the element’s flat edge. By controllably displacing the core within the disk one can thus both increase or decrease the core’s resonant frequency with respect to its value when unshifted. This has the effect of more than doubling the accessible range of resonant frequencies. However, more fundamentally, the above properties lead to a chirality-mediated bistability: for a given finite static in-plane magnetic field, one of two values of gyrotropic frequencies can be observed depending on the vortex chirality. [Phys. Rev. B 96, 060405(R)] Published Mon Aug 07, 2017
Keywords:
Magnetism
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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