2024-03-29T01:11:41Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1818032022-12-15T10:06:30Zcom_10261_34com_10261_5com_10261_78com_10261_3com_10261_101col_10261_287col_10261_331col_10261_354
Quesada, Adrián
Delgado Soria, Guiomar
Pascual, Laura
Aragón, A.M.
Marín, Pilar
Granados-Miralles, Cecilia
Foerster, M.
Aballe, Lucía
Prieto, J. E.
de la Figuera, Juan
Fernández Lozano, José Francisco
Prieto, P.
AMPHIBIAN Project ID:720853
2019-05-20T14:06:09Z
2019-05-20T14:06:09Z
2018
Physical Review B 98 (2018)
http://hdl.handle.net/10261/181803
10.1103/PhysRevB.98.214435
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100000780
Exchange-coupled hard-soft biphase magnets are technologically relevant systems in that they enable tailoring the magnetization reversal process. Here, exchange-spring behavior is observed in CoFe2O4/FeCo bilayers for soft thicknesses as thin as 2 nm, at least four times below the exchange length of the system. This result is in contrast with the accepted theory for spring magnets that states that the exchange length defines the critical thickness below which both magnetic phases should be rigidly coupled. In combination with micromagnetic calculations, this surprising observation is understood as a consequence of the dominance of domain-wall propagation in the soft phase during the reversal process, so far unaccounted for in theoretical descriptions. Our results emphasize the need to expand the existing spring theory from coherent rotation to domain-wall related processes in multidomain configurations in order to accurately design magnetic heterostructures with controllable reversal.
eng
© 2018 American Physical Society
openAccess
Exchage interaction
Magnetic multilayers
Exchange-spring behavior below the exchange length in hard-soft bilayers in multidomain configurations
artículo