Magnetic order in 2D antiferromagnets disclosed by spontaneous anisotropic magnetostriction
M.J.A. Houmes (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
G. Baglioni (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)
M. Siskins (Kavli institute of nanoscience Delft, TU Delft - Dynamics of Micro and Nano Systems)
M. Lee (TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
Dorye L. Esteras (Universidad de Valencia (ICMol))
S. Mañas Valero (Universidad de Valencia (ICMol))
Y.M. Blanter (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
P.G. Steeneken (TU Delft - Dynamics of Micro and Nano Systems, Kavli institute of nanoscience Delft, TU Delft - Precision and Microsystems Engineering, TU Delft - QN/Steeneken Lab)
H.S.J. van der Zant (TU Delft - QN/van der Zant Lab, 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.