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May 7, 2014

Mtg: Control of Magnetism with Oxide Hybrid Structures

by @ 2:38 pm. Filed under ALL, NanoEngineering, Optics/Displays, Semiconductors

TUESDAY May 20, 2014
SCV Magnetics Chapter
– coercivity, phase transition, disorder …
Speaker: Siming Wang, Department of Physics, UC San Diego
Time: Networking and pizza at 6:45 PM; Presentation at 7:30 PM
Cost: none
Place: Western Digital, 1710 Automation Parkway, San Jose
RSVP: not required

An important challenge in basic and applied physics research is the control of the magnetic properties with external stimuli. In this talk, I will present an effective control of magnetic coercivity in oxide/ferromagnet hybrid structures using vanadium oxides, which undergo a metal-to-insulator and a structural phase transition.
When the structural phase transition occurs, vanadium oxide induces a stress in the ferromagnetic film in proximity. The effect leads to a coercivity change at temperatures related to the choice of different vanadium oxides, e.g. 340 K for vanadium dioxide (VO2) and 165 K for vanadium sesquioxide (V2O3). A coercivity change by a factor of two can be achieved in a narrow temperature window of 10 K. V2O3 induces coercivity increases of a ferromagnetic material by 300% in the middle of its structural phase transition. This is attributed to a disorder caused by the phase coexistence in V2O3. Our basic research can open up a new avenue for the coercivity control in magnetic recording media.


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