IEEE Magnetics Society Santa Clara Valley Chapter Meeting Presentation Summary

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Tuesday, May 20^th, 2014

Western Digital, 1710 Automation Parkway, San Jose, CA
Directions and Map
Cookies, Conversation & Pizza too at 6:45 P.M.
Presentation at 7:30 P.M.

Control of Magnetism with Oxide Hybrid Structures

Siming Wang
Department of Physics and Center for Advanced Nanoscience, Materials Science and Engineering Program, University of California San Diego

Abstract

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 [1]. 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 [2]. 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 [3].

This work is done in collaboration with Jose de la Venta, Thomas Saerbeck, Juan Gabriel Ramirez, Ilya Valmianski, and Ivan K. Schuller.

The magnetism aspects of this work were supported by the Office of Basic Energy Science, U.S. Department of Energy, under Grant No. DE FG03-87ER-45332 and the oxide related science by the AFOSR Grant No. FA9550-12-1-0381.

[1] J. de la Venta, S. Wang, J. G. Ramirez, and I. K. Schuller, Appl. Phys. Lett. 102, 122404 (2013).

[2] J. de la Venta, S. Wang, T. Saerbeck, J. G. Ramirez, I. Valmianski, and I. K. Schuller, Appl. Phys. Lett. 104, 062410 (2014).

[3] I. K. Schuller, J. de la Venta, S. Wang, J. G. Ramirez, M. Erekhinskiy, and A. Sharoni, US patent 61/915,715.

LINK TO PRESENTATION

Biography

Prof. Ivan K. Schuller, the director of the Center for Advanced Nanoscience (CAN) at the University of California, San Diego, is a Solid State Physicist. He is winner of major awards such as the Lawrence Award from the US Department of Energy, and several awards from the American Physical Society, the Materials Research Society and the International Union of Materials Research Societies. He has also won several EMMY and other television awards for his science related movies. Prof. Schuller received his undergraduate degree from the University of Chile, PhD from Northwestern University and an Honoris Causa Doctorate from the Spanish Universidad Complutense the largest European University He is a member of the Chilean, Spanish, Belgian and Colombian Academies of Science. His more than 500 papers and 20 patents have been dedicated to many aspects of solid state and materials physics in the field of Nano and Meso science.

Mr. Siming Wang is a PhD candidate in the Materials Science and Engineering Program at the University of California, San Diego, advised by Prof. Ivan K. Schuller. Mr. Wang received his Bachelor’s degree in Physics from Peking University, Beijing, China and a Master’s degree in Materials Science and Engineering from the University of California, San Diego. He is a member of the American Physics Society. He has published 8 papers and holds one US patent. He is an expert on thin film and lithographic techniques. His graduate research is focused on the electrical, magnetic and optical properties of materials which exhibit phase transitions.

Contact:

Ivan K. Schuller: ischuller@ucsd.edu

Siming Wang: swang@physics.ucsd.edu

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