Magnetic properties of hybrid V2O3/Ni composites

Abstract

The magnetic properties of bulk hybrid V2O3/Ni composites were studied as a function of composition and synthesis conditions. We find a sharp increase in the coercivity and a sharp decrease of the magnetization as the temperature of the bulk materials passes through the V2O3 structural phase transition. The magnitude of the effect of the V2O3 phase transformation on the magnetic properties of the Ni is strongly dependent on sintering temperature. The V2O3 crystallite size is also dependent on the sintering conditions. Stress on the Ni particles due to the V2O3 structural transformation produces an inverse magnetostrictive effect which is responsible for the changes in the magnetic properties.

Hydrostatic pressure mapping of barium titanate phase transitions with quenched FeRh

“…Combining both materials, BTO and FeRh in a thin film hybrid, creates a material with several ways to control the magnetic characteristics. Extrapolating the findings from the literature about Ni/ V 2 O 3 pellets 4,6 , it is likely that the obtained control shown in this publication also be transfered from the thin film to the bulk FeRh/BTO. Note that an additional way to control the hybrid characteristic is using the ferroelectricity which potentially can alter material properties similar to other material systems 23 .…”

“…It is noteworthy that this concept is not limited to thin film systems but also applies to mixing intimately two bulk materials, one exhibiting ferromagnetism and the other with at least one SPT 4,6 . Moreover SPT's can be triggered with light 40,41 , current injection 42 , electric fields [43][44][45][46] and more 12,27 , which provide an additional control mechanisms over hybrids of potential interest for data storage, transformer cores and antiferromagnetic/metamagnetic electronic devices.…”

“…Using magnetometry as a detection method opens the door to laboratory based measurements of the pressure induced properties of the SPT, where-as in the past such a measurement would require the use of neutrons to measure d-spacing changes in a pressure cell. Other similar works have followed T. Saerbeck for vanadium oxide hybrids in thin film and bulk 1,[4][5][6][7][8] , however in this work we take this scheme a step further by not relying solely on the weak magnetostriction effect in ferromagnetic films to detect the transition, and instead reveal that the strain sensitive transition in metamagnetic FeRh, combined with its magnetoelasticsensitivity, is a strong tool for studying these responses. These methods are vital for our continued understanding of SPT in these systems as they are of high technological relevance for heat assisted magnetic random access memories (HA-MRAM) 9,10 .…”

Influence of a Thin V2O3 Spacer on Interlayer Interactions in Fe-Ni/V2O3/FeNi Film Structures

“…There are many works that have studied the magnetic properties of VO 2 /Ni [8,9] and V 2 O 3 /Ni [10][11][12] two-layer films and the Ni/V 2 O 3 /FeNi [13] spin-valve structure.…”