Ferroelastic switching for nanoscale non-volatile magnetoelectric devices

Title
Ferroelastic switching for nanoscale non-volatile magnetoelectric devices
Authors
S. H. Baek장호원C. M. FolkmanY. L. LiB.WinchesterJ. X. ZhangQ. HeY. H. ChuC. T. NelsonM. S. RzchowskiX. Q. PanR. RameshL. Q. ChenC. B. Eom
Keywords
Monodomain BiFeO3; Multiferroic; Ferroelastic switching; Stress-induced instability; Magnetoelectric coupling; 2E21722
Issue Date
2010-04
Publisher
Nature materials
Citation
VOL 9, 309-314
Abstract
Multiferroics, where (anti-) ferromagnetic, ferroelectric and ferroelastic order parameters coexist1–5, enable manipulation of magnetic ordering by an electric field through switching of the electric polarization6–9. It has been shown that realization of magnetoelectric coupling in a single-phase multiferroic such as BiFeO3 requires ferroelastic (71°, 109°) rather than ferroelectric (180°) domain switching6. However, the control of such ferroelastic switching in a single-phase system has been a significant challenge as elastic interactions tend to destabilize small switched volumes, resulting in subsequent ferroelastic back-switching at zero electric field, and thus the disappearance of non-volatile information storage10,11. Guided by our phase-field simulations, here we report an approach to stabilize ferroelastic switching by eliminating the stress-induced instability responsible for back-switching using isolated monodomain BiFeO3 islands. This work demonstrates a critical step to control and use non-volatile magnetoelectric coupling at the nanoscale. Beyond magnetoelectric coupling, it provides a framework for exploring a route to control multiple order parameters coupled to ferroelastic order in other low-symmetry materials.
URI
http://pubs.kist.re.kr/handle/201004/37182
ISSN
1476-1122
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KIST Publication > Article
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