Magnetic relaxation of nanowires: beyond the Néel-Brown activation process

Autor:	J. Meier, J.-Ph. Ansermet, William T. Coffey, J. L. Déjardin, Wolfgang Wernsdorfer, Jean-Eric Wegrowe, Bernard Doudin, Y. P. Kalmykov, Bernard Barbara
Rok vydání:	1997
Předmět:	Condensed Matter::Materials Science Materials science Condensed matter physics Field (physics) Time windows Relaxation rate Thermal Nanowire Physics::Optics General Physics and Astronomy Field dependence Magnetic relaxation Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Zdroj:	Europhysics Letters (EPL). 38:329-334
ISSN:	1286-4854 0295-5075
DOI:	10.1209/epl/i1997-00247-9
Popis:	Magnetic relaxation in Ni nanowires was measured both on single nanowires and on an array of about 106 nanowires. The logarithmic relaxation rate S = dM/d ln(t) deduced from after-effect experiments is presented as a function of both the applied field and the temperature. The field dependence S(H) is very similar to the distribution of the switching fields of the nanowires in the array, whereas the field dependence of the relaxation time of one single nanowire is linear in the time window of the experiment. The temperature dependence S(T) of arrays decreases with increasing temperature. The measurement on the macroscopic array is used to infer the thermal behavior of the relaxation time of single nanowires. This temperature dependence is in conflict with the Neel-Brown activation of magnetic monodomains.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::106a2ec047364201335094d344da7220 https://doi.org/10.1209/epl/i1997-00247-9 Zobrazit plný text záznamu