TY - JOUR
T1 - Brillouin light scattering from spin waves in Co100-xCrx alloy films
AU - Yoshihara, Akira
AU - Sato, Hidekuni
AU - Mawatari, Jun Ichi
AU - Yoshida, Kazuetsu
AU - Kitakami, Osamu
AU - Shimada, Yutaka
N1 - Funding Information:
This work was partly supported by the Research for the Future Program of Japan Society for the Promotion of Science under Grant No. 97R14701, and Strage Research Consortium in Japan.
PY - 2000/11
Y1 - 2000/11
N2 - Collective spin waves in Co100-xCrx alloy films (x = 0, 9.2, 15.7 and 35.2 in at%) of 300±5 angstroms in thickness have been studied by means of Brillouin light scattering (BLS) at room temperature in magnetic fields of up to 4.0 kOe. Except for the Co64.8Cr35.2 film, we observed scattering from spin waves and determined the spin wave stiffness constant DB. We obtained a value of DB = (3.47±0.35)×10-9 Oe cm2 (436±44 meV angstroms2) for pure Co. Although this value is in good agreement with recent BLS values, it is rather smaller than the value of 510 meV angstroms2 obtained from neutron scattering. For the alloys, the DB value at x = 15.7 is strongly reduced to approximately 1/4 of the value at x = 9.2, while the saturation magnetization decreases almost linearly as the Cr content increases. We discuss this DB behavior in terms of the Cr segregation which takes a place for Cr contents above x to approximately 12.
AB - Collective spin waves in Co100-xCrx alloy films (x = 0, 9.2, 15.7 and 35.2 in at%) of 300±5 angstroms in thickness have been studied by means of Brillouin light scattering (BLS) at room temperature in magnetic fields of up to 4.0 kOe. Except for the Co64.8Cr35.2 film, we observed scattering from spin waves and determined the spin wave stiffness constant DB. We obtained a value of DB = (3.47±0.35)×10-9 Oe cm2 (436±44 meV angstroms2) for pure Co. Although this value is in good agreement with recent BLS values, it is rather smaller than the value of 510 meV angstroms2 obtained from neutron scattering. For the alloys, the DB value at x = 15.7 is strongly reduced to approximately 1/4 of the value at x = 9.2, while the saturation magnetization decreases almost linearly as the Cr content increases. We discuss this DB behavior in terms of the Cr segregation which takes a place for Cr contents above x to approximately 12.
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U2 - 10.1016/S0304-8853(00)00495-9
DO - 10.1016/S0304-8853(00)00495-9
M3 - Article
AN - SCOPUS:0034317124
VL - 221
SP - 261
EP - 267
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 3
ER -