### Session D7: Focus Session: Magnetic Anisotropy

2:30 PM–5:30 PM, Monday, March 3, 2014
Room: 106

Chair: Weigang Wang, University of Arizona

Abstract ID: BAPS.2014.MAR.D7.5

### Abstract: D7.00005 : FMR Linewidth divergence in V$_{2}$O$_{3}$/Ni bilayers

3:42 PM–3:54 PM

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#### Authors:

Jose de la Venta
(Department of Physics, Colorado State University)

Juan Gabriel Ramirez
(Department of Physics and Center for Advanced Nanoscience, University of California San Diego)

Thomas Saerbeck
(Department of Physics and Center for Advanced Nanoscience, University of California San Diego)

Siming Wang
(Department of Physics and Center for Advanced Nanoscience, University of California San Diego)

Ivan K. Schuller
(Department of Physics and Center for Advanced Nanoscience, University of California San Diego)

The effects of stress on the magnetic properties of ferromagnetic thin films are dramatic when the ferromagnets are in proximity with materials undergoing structural phase transitions (SPT) [1]. Here we report on Ferromagnetic Resonance (FMR) measurements on V$_{2}$O$_{3}$/Ni bilayers across the SPT of V$_{2}$O$_{3}$. The SPT occurs on V$_{2}$O$_{3}$ at 160 K from a metallic/rhombohedral to an insulating/monoclinic phase. Our results reveal a rotation of the anisotropy axis in Nickel films when cooled below the SPT of V$_{2}$O$_{3}$. The obtained anisotropy axis will be compared to the underlying structural morphology obtained from x-ray diffraction. More interestingly, the FMR linewidth as a function of the temperature shows a divergence across the SPT. This suggests a breakdown of the uniform precession of the Ni magnetization caused by the induced strain across the SPT. Discussion among linewidth-broadening mechanisms will be addressed. \\[4pt] [1] J. de la Venta, S. Wang, J. G. Ramirez, and I. K. Schuller, Appl. Phys. Lett. 102, 122404 (2013).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.D7.5