Mechanical Loss in Multiferroic Materials at High Frequencies: Friction and the Evolution of Ferroelastic Microstructures

Zhao, Z. and Ding, X. and Lookman, T. and Sun, J. and Salje, E. K. H. (2013) Mechanical Loss in Multiferroic Materials at High Frequencies: Friction and the Evolution of Ferroelastic Microstructures. Advanced Materials, 25 (23). pp. 3244-3248. ISSN 1521-4095 DOI 10.1002/adma.201300655

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Abstract

The development of novel multiferroic device materials hits a fundamental limitation when the driving frequency is increased beyond 50 MHz. Ultimately, we want to use detectors, memory chips and converters between electric and magnetic signals at such high frequencies. The idea is, hence, that device materials need to be defect free because any extrinsic defect relaxation will be slower than the operating frequency and will hence absorb the external signal. [ 1–5 ] The solution of this conundrum was to use very clean multiferroic materials where the desired change of electric and magnetic dipoles is very fast in thin fi lms. We will show in this paper that this solution does not work in most materials where coupling to ferroelasticity is strong. Empiri- cally, it is already known that the movement of ferroelastic domain boundaries involves high losses and is highly dissipa- tive (e.g. in relaxor materials). [ 6 , 7 ] However, the origin of these losses was unclear. In this paper we demonstrate that only two mechanisms dominate the loss effects, namely, the propagation of needle domains and the movements of wall kinks.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Advanced Materials
Volume: 25
Page Range: pp. 3244-3248
Identification Number: 10.1002/adma.201300655
Depositing User: Sarah Humbert
Date Deposited: 30 Aug 2013 17:42
Last Modified: 02 Sep 2013 15:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/2878

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