Navegando por Autor "Silva, M. L."
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Artigo Ferromagnetic resonance of compensated ferromagnetic/antiferromagnetic bilayers(AIP Publishing LLC, 2012-10-02) Carriço, Artur da Silva; Dantas, Ana L.; Oliveira, L. L.; Silva, M. L.We report a theoretical study of the ferromagnetic resonance (FMR) frequency Ω(H) of Fe/FeF2(110) and Fe/MnF2(110) uniaxial anisotropy compensated bilayers. We show that under external field perpendicular to the anisotropy axis, the uniform mode of the Fe-film becomes soft at an external field strength (H∗=HFA−H⊥int) smaller than the Fe anisotropy field. For strong interface exchange coupling, there is a gap in the FMR spectrum. In this case, Ω(H) is a monotonically increasing function of the external field strength and for any value of the external field strength Ω(H)>Ω(0). The value of the effective interface field downshifts (H⊥int) and the value of Ω(0) may be used to estimate the interface exchange energy.Artigo Heat capacity of compensated F/AF bilayers(ELSEVIER, 2005) Silva, M. L.; Dantas, Ana L.; Carriço, Artur da SilvaWe report a theoretical study of the magnetic heat capacity, cV(T), of exchange coupled compensated ferromagnet/antiferromagnetic bilayers. We show that cV(T) may display a large peak at the temperature TR where the interface magnetic frustration induces a 90° reorientation of the F layer. We study Fe/FeF2 bilayers and show that TR and the magnitude of the cV(T) peak depend on the strength of the interface exchange. We suggest how the sign of the interface exchange energy parameter can be investigated using features produced by external fields.