Spin-selective response tunability in two-dimensional nanomagnet

Abstract

Recent reports on the two-dimensional (2D) material CrOCl revealed magnetic ordering and spin polarisation with Curie Temperature T c ∼ 160 K, values higher than most diluted magnetic semiconductors. Here, we investigate the uniaxial and biaxial strain-dependent electronic and transport properties of CrOCl monolayer using rst-principles based calculations. The calculated Young's modulus indicates high mechanical exibility for the application of high strain. Our study shows that strain can induce phase changes from a bipolar magnetic semiconductor → half metal → magnetic metal in the material, leading to interesting spin-resolved conductance with 100% spin ltering. Furthermore, the current-voltage (I -V) response showed conductance uctuations, characterised by peak to valley ratio and switching ef ciency offering high strain assisted tunability. Overall, CrOCl shows a highly anisotropic behaviour with the material displaying 100% spin polarisation in the tensile strain region. The electronic, transport and mechanical properties indicate that CrOCl is a versatile 2D material with multi-phase capabilities having promising applications for future nanospintronic devices.

The Magnetic Genome of Two-Dimensional van der Waals Materials

“…Tensile strain can change the coupling between local spins, Curie temperature, and transitions between FM and AF phases of 2D magnets. 234 , 330 , 657 , 666 , 667 , 677 , 678 For example, the strength of the exchange coupling and spin polarization of VZ 2 (Z = S, Se, Te) monolayers are able to be altered via strain modulation (−5% to 5%) due to the effect on the ionic–covalent interactions between V and Z atomic pairs, where the increased unpaired electrons in the interacting atoms change the magnetic moments. 691 Similar phenomena are observed in semiconducting or insulating 2D transition-metal trichalcogenides (MYX 3 ), and the strain required for magnetic phase change is chemical composition-dependent.…”

Electronic phase-crossover and room temperature ferromagnetism in a two-dimensional (2D) spin lattice

“…However, the magnetic properties can be ne-tuned, as desired, through the application of a few engineering techniques. 22,23 Cr 2 Ge 2 Te 6 (CGT) is a newly discovered 2D magnetic material which has gained great attention recently because of its ability to be exfoliated to the monolayer limit 24 similar to that of CrI 3 . 25 Moreover, recent investigations have shown the feasibility of formation of stable heterostructures with several other 2D materials like graphene, 26 CrI 3 27 and topological insulators, 28,29 observation of photoluminescence 30 and magneto-optical effects.…”

CrXY (X/Y = S, Se, Te) monolayers as efficient anode materials for Li and Na-ion batteries: a first-principles study

“…The Janus transition-metal dichalcogenides exhibit inherent ferromagnetism with high Curie temperatures 34,35 and substantial spin polarisation 36 with interesting spin-transport. 37,38 But they have not been reported for their use in electrode material.…”