2024-03-29T02:36:37Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1208722021-10-27T07:42:30Zcom_10261_31com_10261_3col_10261_284
Origin of slow magnetic relaxation in Kramers ions with non-uniaxial anisotropy
Gómez-Coca, Silvia
Urtizberea, A.
Cremades, Eduard
Alonso, Pablo J.
Camón, Agustín
Ruiz, Eliseo
Luis, Fernando
Ministerio de Economía y Competitividad (España)
Gobierno de Aragón
Generalitat de Catalunya
Ministerio de Educación, Cultura y Deporte (España)
Transition metal ions with long-lived spin states represent minimum size magnetic bits. Magnetic memory has often been associated with the combination of high spin and strong uniaxial magnetic anisotropy. Yet, slow magnetic relaxation has also been observed in some Kramers ions with dominant easy-plane magnetic anisotropy, albeit only under an external magnetic field. Here we study the spin dynamics of cobalt(II) ions in a model molecular complex. We show, by means of quantitative first-principles calculations, that the slow relaxation in this and other similar systems is a general consequence of time-reversal symmetry that hinders direct spin-phonon processes regardless of the sign of the magnetic anisotropy. Its magnetic field dependence is a subtle manifestation of electronuclear spin entanglement, which opens relaxation channels that would otherwise be forbidden but, at the same time, masks the relaxation phenomenon at zero field. These results provide a promising strategy to synthesize atom-size magnetic memories. © 2014 Macmillan Publishers Limited. All rights reserved.
2015-07-31T09:31:17Z
2015-07-31T09:31:17Z
2014
2015-07-31T09:31:18Z
artículo
Nature Communications 5: 4300 (2014)
http://hdl.handle.net/10261/120872
10.1038/ncomms5300
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100002809
http://dx.doi.org/10.13039/501100003176
http://dx.doi.org/10.13039/501100010067
eng
Postprint
http://dx.doi.org/10.1038/ncomms5300
Sí
openAccess
Nature Publishing Group