Electric-field-induced spin disorder-to-order transition near a multiferroic triple phase point

The emergence of a triple phase point in a two-dimensional parameter space (such as pressure and temperature) can offer unforeseen opportunities for the coupling of two seemingly independent order parameters. On the basis of this, we demonstrate the electric control of magnetic order by manipulating...

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Bibliographic Details
Published in:Nature physics 2017-02, Vol.13 (2), p.189-196
Main Authors: Jang, Byung-Kweon, Lee, Jin Hong, Chu, Kanghyun, Sharma, Pankaj, Kim, Gi-Yeop, Ko, Kyung-Tae, Kim, Kwang-Eun, Kim, Yong-Jin, Kang, Kyungrok, Jang, Han-Byul, Jang, Hoyoung, Jung, Min Hwa, Song, Kyung, Koo, Tae Yeong, Choi, Si-Young, Seidel, Jan, Jeong, Yoon Hee, Ohldag, Hendrik, Lee, Jun-Sik, Yang, Chan-Ho
Format: Article
Language:English
Subjects:
639/766/119/2795
639/766/119/996
639/766/119/997
Absorption spectroscopy
Antiferromagnetism
Atomic
Classical and Continuum Physics
Complex Systems
Condensed Matter Physics
Coupling
Critical phenomena
Electric fields
Ferroelectric materials
Ferroelectricity
Lanthanum
Magnetism
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Order parameters
Phase transitions
Physics
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Theoretical
Thin films
X rays
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Summary:The emergence of a triple phase point in a two-dimensional parameter space (such as pressure and temperature) can offer unforeseen opportunities for the coupling of two seemingly independent order parameters. On the basis of this, we demonstrate the electric control of magnetic order by manipulating chemical pressure: lanthanum substitution in the antiferromagnetic ferroelectric BiFeO 3 . Our demonstration relies on the finding that a multiferroic triple phase point of a single spin-disordered phase and two spin-ordered phases emerges near room temperature in Bi 0.9 La 0.1 FeO 3 ferroelectric thin films. By using spatially resolved X-ray absorption spectroscopy, we provide direct evidence that the electric poling of a particular region of the compound near the triple phase point results in an antiferromagnetic phase while adjacent unpoled regions remain magnetically disordered, opening a promising avenue for magnetoelectric applications at room temperature. The triple point is a well-known feature on pressure–temperature phase diagrams. A multiferroic triple point is now reported for La-doped BiFeO 3 ; La concentration and temperature are the phase variables and the phases display different spin (dis)order.
ISSN:1745-2473
1745-2481
DOI:10.1038/nphys3902