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Rotatable anisotropy driven training effects in exchange biased Co/CoO films

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Rotatable anisotropy driven training effects in exchange biased Co/CoO films

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Título Rotatable anisotropy driven training effects in exchange biased Co/CoO films
Autor Dias, Thiago
Menéndez Dalmau, Enric
Liu, Haoliang
Van Haesendonck, Christian
Vantomme, A.
Temst, Kristiaan
Schmidt, Joao Edgar
Giulian, Raquel
Geshev, Julian Penkov
Abstract The training effect for exchange bias in field-cooled Co/CoO bilayers films is investigated. Previous experiments on the same system have shown that, starting from the ascending branch of the first hysteresis loop, coherent magnetization rotation is the dominant reversal mechanism. This is confirmed by the performed numerical simulations, which also indicate that the training is predominantly caused by changes of the rotatable anisotropy parameters of uncompensated spins at the Co/CoO interface. Moreover, in contrast with what is commonly assumed, the exchange coupling between the rotatable spins and the ferromagnetic layer is stronger than the coupling between the ferromagnet and the spins responsible for the bias. Thus, uncompensated spins strongly coupled to the ferromagnet contribute to the coercivity rather than to the bias, whatever the strength of their magnetic anisotropy.
Contido em Journal of applied physics. New York. Vol. 115, no. 24 (June 2014), 243903, 6 p.
Assunto Anisotropia magnetica
Compostos de cobalto
Filmes finos magneticos
Forca coerciva
Histerese magnética
Magnetismo de interface
Materiais ferromagneticos
Reversão de magnetização
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/107857
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