Multiferroics

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Abstract

Prof James F Scott
University of St Andrews

Multiferroics are crystals that simultaneously exhibit ferromagnetism and ferroelectricity (and usually ferroelasticity, which is hysteretic stress/strain).  In some cases the ferromagnetism is actually created by the ferroelectricity, by causing the spins to cant [via Dzyaloshinskii-Moriya anisotropic exchange: P.(L x M)].  These materials have become very popular in part due to the interesting new physics, previously neglected because the effects require very low crystal symmetry, and because they offer the promise of new kinds of memory devices, including voltage-tunable magnetic tunnel junctions and four-state memories (+P,+M; +P,-M; -P,+M; -P,-M) which would be vastly superior to the usual binary (0,1) Boolean algebra. At St. Andrews I am experimentally studying GaFeO3 and Pb[Fe(1/2)Ta(1/2)]y[Ti(1/2)Zr(1/2)(1-y)]O3.

  • Venue

    Lecture Theatre C, Physics, University of St. Andrews, St. Andrews, Fife, Scotland

  • Date

    September 25, 2015

  • Time

    From: 10h00 To: 11h00

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