Temperature Dependence of the Coercivity of VO$_{\mathrm{2}}$/Ni Bilayers

ORAL

Abstract

The temperature dependence of the coercivity and magnetization of VO$_{\mathrm{2}}$/Ni bilayers was studied. VO$_{\mathrm{2}}$ exhibits a well-known Structural Phase Transition (SPT) at 330-340 K, from a low temperature monoclinic (M) to a high temperature rutile (R) structure. VO$_{\mathrm{2}}$/Ni bilayers were grown using a magnetron sputtering technique onto different substrates. The magnetic properties were measured using a Vibrating Sample Magnetometer. The SPT of VO$_{\mathrm{2}}$ induces an inverse magnetoelastic effect that strongly modifies the coercivity and magnetization of the Ni films. In addition, the growth conditions allow tuning of the magnetic properties. Ni films deposited in the rutile phase on top of VO$_{\mathrm{2}}$ (M) show an irreversible change in the coercivity after the first cycle through the high temperature phase, with a corresponding change in the surface morphology. On the other hand, the Ni films grown on top of VO$_{\mathrm{2}}$ (R) do not show this irreversibility. These results indicate that: i) magnetic properties of magnetic films are strongly affected by the strain induced by materials that undergo a structural phase transition; and ii) it is possible to control the properties by tuning the growth conditions.

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Authors

  • Joshua Lauzier

    Colorado State Univ

  • Scott D. Bergesen

    Santa Fe Institute, Arizona State University, Department of Physics and Center for Biological Physics, Arizona State University, Brigham Young University Department of Physics and Astronomy, Brigham Young University, Utah Valley University, Dixie State College, Advisor, Student, Massachusetts Institute of Technology, Thomas Jefferson National Accelerator Laboratory, Colorado College, United States Air Force Academy, Georgia Institute of Technology, Utah State University, Brigham Young University - Idaho, Utah State University- Logan, National Institute of Standards and Technology, Humboldt State University, UC Santa Cruz, Institut de Chimie des Substances Naturelles, Arizona State Univ, University of Colorado at Colorado Springs, National Jewish Health, Department of Physics, The University of Texas at Austin, Department of Physics, New Mexico State University, U. S. Air Force Academy, Brigham Young Univ - Provo, University of New South Wales, University of Texas, University of Warwick, University of Louisiana, Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA., Center for Materials Genomics, Department of Mechanical Engineering and Materials Science and Department of Physics, Duke University, Durham, North Ca, Duke University, Durham, North Carolina., Brigham Young University -- Provo, Utah, General Atomics -- San Diego, California, Department of Mathematics, University of British Columbia, Department of Physics, Arizona State University, UC Riverside, UMASS, STScI, NOAO, UT Austin, Texas A&M, Arizona State Univeristy, New Mexico State Univ, Los Alamos National Laboratory, Colorado State Univ, Department of Physics, Oregon State University, Colorado School of Mines, University of Alaska, Fairbanks, The Peac Institute of Multiscale Modeling, UNSW Canberra

  • Jose de la Venta

    Colorado State Univ