Magnetism and spin exchange coupling in strained monolayer CrOCl
| Autor: | Xiaomei Qing, Jun-Ming Liu, Hua Li, Pengxia Zhou, Zhengchao Dong, Chonggui Zhong |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Spintronics Magnetism General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Inductive coupling Ferromagnetism Superexchange 0103 physical sciences Monolayer Antiferromagnetism Curie temperature Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology |
| Zdroj: | Physical chemistry chemical physics : PCCP. 22(30) |
| ISSN: | 1463-9084 |
| Popis: | The magnetism and spin exchange coupling of monolayer CrOCl with different strains are investigated systematically using first principles. It is found that the magnetic ground state can be changed from ferromagnetic (FM) to antiferromagnetic (AFM), and the Curie temperature (TC) is enhanced significantly by applying the uniaxial strain along a- or b-axis direction. The variations of spin exchange coupling are explained according to the Goodenough–Kanamori–Anderson (GKA) and Bethe–Slater Interaction (BSI) rules. The strain-dependent magnetic state is mainly attributed to the competition between direct exchange interactions of cation–cation and indirect superexchange ones of cation–anion–cation in monolayer CrOCl. The different competitions in a- and b-axis direction determine the different critical intervals R of magnetic transitions, where R is the distance of the two nearest-neighbor (NN) Cr3+ ions. The AFM-FM transition occurs at R/r3d = 2.9 and 3.75 in a-axis direction, while it happens at R/r3d = 2.65 along b-axis direction. These results indicate that the sensitive relevancy between the external strain and magnetic coupling makes monolayer CrOCl a promising candidate for spintronics. |
| Databáze: | OpenAIRE |
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