Spin-wave resonance and magnetic anisotropy in FePt thin films |
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Authors: | A Martins SC Trippe AD Santos F Pelegrini |
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Institution: | 1. Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia (GO), Brazil;2. Instituto de Física, Universidade de São Paulo, 05315-970 São Paulo (SP), Brazil |
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Abstract: | Ferromagnetic Resonance (FMR) measurements at room temperature and X-band microwave frequency were performed on polycrystalline FePt thin films with face-centered cubic structure. With the external field perpendicular to the film plane, the absorption fields Hn of the odd and even spin-wave resonance modes n detected for the Fe0.44Pt0.56(45 nm)/Si(1 0 0) and Fe0.51Pt0.49(105 nm)/Pt(55 nm)/MgO(1 0 0) films, were found to obey the well-known Hn×n2 ratio, giving for these films the exchange stiffness constant values of 3.9×10−8 and 4.4×10–7 erg/cm, respectively. The study of the out-of-plane angular dependence of the absorption field of the uniform FMR mode allowed the measurement of the effective magnetic anisotropy constants of 5.3×106 , 6.4×106 , and 6.7×106 erg/cm3, related, respectively, to the 1 1 1], 1 0 0], and 1 1 0] textures present in the films. |
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Keywords: | 76 50 +g 75 30 Ds 75 30 Gw |
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