Probing the spin dimensionality in single-layer CrSBr van der Waals heterostructures by magneto-transport measurements

Abstract

Two-dimensional (2D) magnetic materials offer unprecedented opportunities for fundamental physics and applied research in spintronics and magnonics. Beyond the pioneering studies on 2D CrI3 and Cr2Ge2Te6, this emerging field has expanded to 2D antiferromagnets exhibiting different spin anisotropies and textures. Of particular interest is the layered metamagnet CrSBr, a relatively air-stable semiconductor formed by antiferromagnetically-coupled ferromagnetic layers (Tc~150 K) that can be exfoliated down to the single-layer. It presents a complex magnetic behavior with a dynamic magnetic crossover leading to a low-temperature hidden order below T*~40 K. Here, we inspect the magneto-transport properties of CrSBr vertical heterostructures in the 2D limit. Our results demonstrate the marked low-dimensional character of the ferromagnetic monolayer, with short-range correlations above Tc and an Ising-type in-plane anisotropy, being the spins spontaneously aligned along the easy-axis b below Tc. By applying moderate magnetic fields along a and c axes, a spin reorientation occurs, leading to a magnetoresistance enhancement below T*. In multilayers, a spin-valve behavior is observed, with negative magnetoresistance strongly enhanced along the three directions below T*. These results show that CrSBr monolayer/bilayer provides an ideal platform for studying and controlling field-induced phenomena in two-dimensions, offering new insights regarding 2D magnets and their integration into vertical spintronic devices.

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References in corpus (7)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
• Triaxial magnetic anisotropy in the two-dimensional ferromagnetic semiconductor CrSBr
• Quasi 1D electronic transport in a 2D magnetic semiconductor
• Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr
• Spin waves and magnetic exchange Hamiltonian in CrSBr
• Towards fully two-dimensional spintronic devices

Cited by in corpus (5)

• Multistep magnetization switching in orthogonally twisted ferromagnetic monolayers
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• Magnon straintronics in the 2D van der Waals ferromagnet CrSBr from first-principles
• Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor
• Tailoring spin waves in 2D transition metal phosphorus trichalcogenides via atomic-layer substitution