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Magnetization and Magnetic Anisotropy of Co/W Multilayers
Author(s) -
Spasova M.,
Wiedwald U.,
Ramchal R.,
Farle M.,
Jergel M.,
Majkova E.,
Luby S.,
Senderak R.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200106)225:2<449::aid-pssb449>3.0.co;2-3
Subject(s) - materials science , ferromagnetic resonance , condensed matter physics , magnetization , crystallite , lattice constant , anisotropy , magnetic anisotropy , magnetometer , magnetic moment , ferromagnetism , laser linewidth , x ray reflectivity , diffraction , nuclear magnetic resonance , thin film , optics , magnetic field , physics , nanotechnology , metallurgy , laser , quantum mechanics
The magnetic properties of polycrystalline Co/W multilayers have been investigated using angular‐dependent ferromagnetic resonance (FMR) and SQUID magnetometry. Two sets of samples with a constant thickness of Co layers (CoI: d Co = 1 nm and CoII: d Co = 2.5 nm) and varying W layer thickness (1 to 7 nm) were studied. The structure of the multilayers was analysed by X‐ray reflectivity (XRR) and X‐ray diffraction (XRD). We found a well‐defined 〈110〉 texture and coherent structure of the multilayers. The saturation magnetization of Co is smaller than that of bulk Co which is explained by a reduced Co moment at the interfaces of more than 50%. A narrow FMR linewidth on the order of 200 Oe at 9.5 GHz is observed for CoI and CoII multilayers with d W ≈ 1 nm that indicates the high magnetic homogeneity of the Co layers. The second and fourth‐order magnetic anisotropy constants ( K 2 , K 4⟂ ) are found to be independent of the Co layer thickness. K 2 is inversely proportional to the W layer thickness, which is due to the changing lateral lattice mismatch with the W layers.