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Magnetic‐Structure‐Stabilized Polarization in an Above‐Room‐Temperature Ferrimagnet
Author(s) -
Li ManRong,
Retuerto Maria,
Walker David,
Sarkar Tapati,
Stephens Peter W.,
Mukherjee Swarnakamal,
Dasgupta Tanusri Saha,
Hodges Jason P.,
Croft Mark,
Grams Christoph P.,
Hemberger Joachim,
SánchezBenítez Javier,
Huq Ashfia,
Saouma Felix O.,
Jang Joon I.,
Greenblatt Martha
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201406180
Subject(s) - ferrimagnetism , multiferroics , lone pair , spintronics , polarization (electrochemistry) , materials science , polar , condensed matter physics , corundum , density functional theory , second harmonic generation , ion , electron , crystallography , ferroelectricity , ferromagnetism , chemistry , magnetization , physics , magnetic field , computational chemistry , optoelectronics , optics , molecule , dielectric , laser , quantum mechanics , metallurgy , organic chemistry , astronomy
Above‐room‐temperature polar magnets are of interest due to their practical applications in spintronics. Here we present a strategy to design high‐temperature polar magnetic oxides in the corundum‐derived A 2 BB′O 6 family, exemplified by the non‐centrosymmetric ( R 3) Ni 3 TeO 6 ‐type Mn 2+ 2 Fe 3+ Mo 5+ O 6 , which shows strong ferrimagnetic ordering with T C =337 K and demonstrates structural polarization without any ions with ( n −1)d 10 n s 0 , d 0 , or stereoactive lone‐pair electrons. Density functional theory calculations confirm the experimental results and suggest that the energy of the magnetically ordered structure, based on the Ni 3 TeO 6 prototype, is significantly lower than that of any related structure, and accounts for the spontaneous polarization (68 μC cm −2 ) and non‐centrosymmetry confirmed directly by second harmonic generation. These results motivate new directions in the search for practical magnetoelectric/multiferroic materials.