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カデットプログラム後援セミナー

カデットプログラム後援セミナー

2013年9月18日

カデットプログラム後援セミナー
日時:9月18日(水) 15:30-17:00

場所:基礎工学部D棟 D404-408 共用セミナー室

講演題目: Electrocalorics and magnetoelectrics

講演者:Dr. Neil D. Mathur (University of Cambridge)

講演概要:
The first hour will be devoted to electrocaloric materials and applications, where thermal effects are driven by changes of electric field, notably near ferroelectric phase transitions. I will present a brief history of the field, a comparison of bulk and thin-film samples, and the advantages of working with the multilayer capacitor (MLC) geometry. Next I will report giant electrocaloric strength in single-crystal BaTiO3. Then I will compare the energy efficiency of ceramic and polymer films. I will finish by comparing electrocaloric materials with magnetocaloric and mechanocaloric materials, before proceeding to a general comparison of different cooling technologies.

I will then spend 30 minutes talking about imaging ferromagnetic films on active ferroelectric substrates. Using photoemission electron microscopy (PEEM) to image ferromagnetic (ferroelectric) domains via contrast from x-ray magnetic circular (linear) dichroism (XMCD and XMLD), I will present magnetic maps that reveal how films of a ferromagnetic film react to strain from a ferroelectric substrate whose domains are under thermal and electrical control. The microscopic data correlates with macroscopic data from a vibrating sample magnetometer (VSM), and ferromagnetic domain-wall motion decorates ferroelectric domain-wall motion,

連絡先:木村剛
(基礎工学研究科・物質創成専攻・物性物理工学領域)
(内線6455,kimura@mp.es.osaka-u.ac.jp)

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