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Flexomagnetism and vertically graded Néel temperature of antiferromagnetic Cr2O3 thin films
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Flexomagnetism and vertically graded Néel temperature of antiferromagnetic Cr2O3 thin films
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Journal Article
Flexomagnetism and vertically graded Néel temperature of antiferromagnetic Cr2O3 thin films
2022
Overview
Antiferromagnetic insulators are a prospective materials platform for magnonics, spin superfluidity, THz spintronics, and non-volatile data storage. A magnetomechanical coupling in antiferromagnets offers vast advantages in the control and manipulation of the primary order parameter yet remains largely unexplored. Here, we discover a new member in the family of flexoeffects in thin films of Cr
2
O
3
. We demonstrate that a gradient of mechanical strain can impact the magnetic phase transition resulting in the distribution of the Néel temperature along the thickness of a 50-nm-thick film. The inhomogeneous reduction of the antiferromagnetic order parameter induces a flexomagnetic coefficient of about 15
μ
B
nm
−2
. The antiferromagnetic ordering in the inhomogeneously strained films can persist up to 100 °C, rendering Cr
2
O
3
relevant for industrial electronics applications. Strain gradient in Cr
2
O
3
thin films enables fundamental research on magnetomechanics and thermodynamics of antiferromagnetic solitons, spin waves and artificial spin ice systems in magnetic materials with continuously graded parameters.
Flexomagnetism refers to the modification of the magnetic properties of a material due to inhomogeneous strain, and offers a promising pathway to the control and manipulation of magnetism. Here, Makushko et al. explore flexomagnetism in antiferromagnetic thin films of Cr
2
O
3
, demonstrating a gradient of the Néel temperature as a result of an inhomogeneous strain.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
