Magnetic order in 2D antiferromagnets disclosed by spontaneous anisotropic magnetostriction
Maurits J.A. Houmes (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)
Gabriele Baglioni (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Makars Šiškins (Kavli institute of nanoscience Delft, TU Delft - Mechanical Engineering)
Martin Lee (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Dorye L. Esteras (Universidad de Valencia (ICMol))
Samuel Mañas-Valero (Universidad de Valencia (ICMol))
Yaroslav M. Blanter (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Peter G. Steeneken (TU Delft - Mechanical Engineering, Kavli institute of nanoscience Delft, TU Delft - Mechanical Engineering, TU Delft - Applied Sciences)
Herre S.J. Van Der Zant (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
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Abstract
The temperature dependent order parameter provides important information on the nature of magnetism. Using traditional methods to study this parameter in two-dimensional (2D) magnets remains difficult, however, particularly for insulating antiferromagnetic (AF) compounds. We show that its temperature dependence in AF MPS3 (M(II) = Fe, Co, Ni) can be probed via the anisotropy in the resonance frequency of rectangular membranes, mediated by a combination of anisotropic magnetostriction and spontaneous staggered magnetization. Density functional calculations followed by a derived orbital-resolved magnetic exchange analysis confirm and unravel the microscopic origin of this magnetization inducing anistropic strain. We further show that the temperature and thickness dependent order parameter allows to deduce the material's critical exponents characterising magnetic order. Nanomechanical sensing of magnetic order thus provides a future platform to investigate 2D magnetism down to the single-layer limit.