On the origin of magnetic anisotropy in two dimensional CrI3
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Título: | On the origin of magnetic anisotropy in two dimensional CrI3 |
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Autor/es: | Lado, Jose L. | Fernández-Rossier, Joaquín |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Magnetic anisotropy | Two dimensions | CrI3 |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 19-jun-2017 |
Editor: | IOP Publishing |
Cita bibliográfica: | 2D Materials. 2017, 4(3): 035002. doi:10.1088/2053-1583/aa75ed |
Resumen: | The observation of ferromagnetic order in a monolayer of CrI3 has been recently reported, with a Curie temperature of 45 K and off-plane easy axis. Here we study the origin of magnetic anisotropy, a necessary ingredient to have magnetic order in two dimensions, combining two levels of modeling, density functional calculations and spin model Hamiltonians. We find two different contributions to the magnetic anisotropy of the material, favoring off-plane magnetization and opening a gap in the spin wave spectrum. First, ferromagnetic super-exchange across the ≃90 degree Cr–I–Cr bonds, are anisotropic, due to the spin–orbit interaction of the ligand I atoms. Second, a much smaller contribution that comes from the single ion anisotropy of the S = 3/2 Cr atom. Our results permit to establish the XXZ Hamiltonian, with a very small single ion anisotropy, as the adequate spin model for this system. Using spin wave theory we estimate the Curie temperature and we highlight the essential role played by the gap that magnetic anisotropy induces on the magnon spectrum. |
Patrocinador/es: | We acknowledge financial support by Marie-Curie-ITN 607904-SPINOGRAPH. JFR acknowledges financial supported by MEC-Spain (MAT2016-78625-C2). This work has been supported in part by ERDF funds through the Portuguese Operational Program for Competitiveness and Internationalization COMPETE 2020, and National Funds through FCT- The Portuguese Foundation for Science and Technology, under the project PTDC/FIS-NAN/4662/2014 (016656). J L Lado thanks the hospitality of the Departamento de Fisica Aplicada at the Universidad de Alicante. |
URI: | http://hdl.handle.net/10045/67456 |
ISSN: | 2053-1583 |
DOI: | 10.1088/2053-1583/aa75ed |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2017 IOP Publishing Ltd |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1088/2053-1583/aa75ed |
Aparece en las colecciones: | Investigaciones financiadas por la UE INV - Grupo de Nanofísica - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2017_Lado_Fernandez_2DMaterials_final.pdf | Versión final (acceso restringido) | 1,39 MB | Adobe PDF | Abrir Solicitar una copia |
2017_Lado_Fernandez_2DMaterials_accepted.pdf | Accepted Manuscript (acceso abierto) | 2,96 MB | Adobe PDF | Abrir Vista previa |
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