Brillouin light scattering from spin waves in Co100−xCrx alloy films

Brillouin light scattering from spin waves in Co100−xCrx alloy films
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Co100−xCrx 合金薄膜中自旋波的布里渊光散射

DOI:
10.1016/s0304-8853(00)00495-9
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发表时间:
2000
影响因子:
2.7
通讯作者:
Y. Shimada
Y. Shimada
中科院分区:
材料科学3区
文献类型:
--
作者:
A. Yoshihara;H. Sato;Junichiro Mawatari;K. Yoshida;O. Kitakami;Y. Shimada

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在室温下,在高达 4.0kOe 的磁场中,通过布里渊光散射 (BLS) 研究了厚度为 300±5Å 的 Co100−xCrx 合金薄膜(x=0、9.2、15.7 和 35.2 at%)中的集体自旋波。除Co64.8Cr35.2薄膜外,我们观察了自旋波的散射并确定了自旋波刚度常数DB。对于纯Co,我们得到的值为DB=(3.47±0.35)×10−9Oecm2(436±44meVÅ2)。虽然该值与最近的BLS值非常吻合,但它比中子散射得到的510meVÅ2值要小得多。对于合金,x=15.7 时的 DB 值大幅降低至 x=9.2 时值的~1/4,而饱和磁化强度随着 Cr 含量的增加几乎呈线性下降。我们根据 Cr 偏析来讨论这种 DB 行为,Cr 含量高于 x∼12 时会出现这种现象。
Collective spin waves in Co100−xCrxalloy films (x=0, 9.2, 15.7 and 35.2 in at%) of 300±5Å in thickness have been studied by means of Brillouin light scattering (BLS) at room temperature in magnetic fields of up to 4.0kOe. Except for the Co64.8Cr35.2film, we observed scattering from spin waves and determined the spin wave stiffness constant DB. We obtained a value of DB=(3.47±0.35)×10−9Oecm2(436±44meVÅ2) for pure Co. Although this value is in good agreement with recent BLS values, it is rather smaller than the value of 510meVÅ2obtained from neutron scattering. For the alloys, the DBvalue at x=15.7 is strongly reduced to ∼1/4 of the value at x=9.2, while the saturation magnetization decreases almost linearly as the Cr content increases. We discuss this DBbehavior in terms of the Cr segregation which takes a place for Cr contents above x∼12.
A.Yoshihara:“具有垂直各向异性的溅射薄膜中的静磁自旋波;CoCr”Jpn.J.Appl.Phys。
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