Controlling magnetization dynamics in hybrid materials via first-order phase transitions
Abstract
The coupling of electronic, magnetic, and structural properties between two dissimilar materials in contact can induce novel functionalities. These proximity effects are enhanced when different length or time scales of the individual materials are competing. Here we report on a drastic modification of the magnetization dynamics of thin Nickel films in Ni/V2O3 hybrid bilayers. We performed temperature-dependent ferromagnetic resonance measurements across the first-order structural phase transition (SPT) of V2O3. The results show a strong coupling of the V2O3 lattice dynamics to the magnon spectra of the Ni film in proximity. We have done similar measurements across the second-order SPT in Ni/SrTiO3 hybrids. In this later case, only a slight change of the static magnetization was found with no modification of the magnetization dynamics. Our results indicate that the phase coexistence across the first-order SPT of V2O3 is responsible for the effects observed in the Ni/V2O3 hybrids. This suggests the existence of similar effects in other hybrid materials with first-order structural phase transitions. Support from BES-USDOE, (DE FG03-87ER-45332), AFOSR (FA9550-12-1-0381), Spanish MINECO (MAT2012-33037), Catalan DURSI (2009SGR856, 2014SGR220), EU-FEDER funds, and the U. Barcelona.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2015
- Bibcode:
- 2015APS..MARZ29014R