Spin Wave-Stiffness Constants of Half-Metallic Ferromagnets ${\rm Co}_{2}YZ$ ($Y={\rm Cr}$, Mn, and Fe, $Z={\rm Ga}$, Al, and Si) Heusler Alloys
Spin Wave-Stiffness Constants of Half-Metallic Ferromagnets ${\rm Co}_{2}YZ$ ($Y={\rm Cr}$, Mn, and Fe, $Z={\rm Ga}$, Al, and Si) Heusler Alloys
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半金属铁磁体 ${ m Co}_{2}YZ$ ($Y={ m Cr}$, Mn, 和 Fe, $Z={ m Ga}$, Al, 的自旋波刚度常数
DOI：
10.1109/tmag.2011.2158521
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发表时间：
2011
影响因子：
2.1
通讯作者：
R. Kainuma
中科院分区：
文献类型：
--
作者：
R. Umetsu;A. Okubo;A. Fujita;T. Kanomata;K. Ishida;R. Kainuma
对Co<sub>2</sub>CrGa、Co<sub>2</sub>MnGa、Co<sub>2</sub>Mn（Al<sub>1-</sub> x</ sub> x</i> x</i>）、Co<sub>2</sub>Fe（Al<sub>1-</sub> x</i> x</i>）和Co<sub>2</sub>Fe（Ga<sub>1-</sub> x</i> x</i>）等Heusler合金的自转波刚度常数<i>D</i>和Curie温度<i>T</i> 2</ i> 4 C</sub>)相进行了热磁化测量。对于Co<sub>2</sub>CrGa, Co<sub>2</sub>MnGa和Co<sub>2</sub>Mn（Al<sub>1-</sub><i>x</i>Si<i>x</i>）合金，<i>D</i>和</i> T</i><sub>C</sub>)之间存在线性关系。<i>D</i>和<i>T</i><sub>C</sub>的趋势与Co<sub>2</sub>Fe（Al<sub>1 1-</sub><i>x</i>Si< /i> x</i>）和Co<sub>2</sub>Fe（Ga<sub>1-</ i>x</i> x</i>Si< /i> x</i>）合金的趋势不同，即<i>T</i><sub>C</sub>在1040 ~ 1100 K温度范围内，表明浓度依赖性较弱，而<i>D</i>对成分敏感。例如，<i>D</i>从2.28 meV·nm<sup>2</sup>对于<i>x</i>=1 （Co<sub>2</sub>FeSi）到5.24 meV·nm<sup>2</sup>对于<i>x</i>=0 (Co<sub>2</sub>Fe （Ga<sub>1-</sub><i>x</i>Si<i>x</i>）合金。结果表明，含铁co基Heusler合金对温度的磁稳定性不仅受自旋波激发的影响，还受其他类型激发的影响。
The spin-wave stiffness constant <i>D</i> and the Curie temperature <i>T</i><sub>C</sub> for series of <i>L</i>2<sub>1</sub> phase in Co<sub>2</sub>CrGa, Co<sub>2</sub>MnGa, Co<sub>2</sub>Mn(Al<sub>1-</sub><i>x</i>Si<i>x</i>) , Co<sub>2</sub>Fe(Al<sub>1-</sub><i>x</i>Si<i>x</i>), and Co<sub>2</sub>Fe(Ga<sub>1-</sub><i>x</i>Si<i>x</i>) Heusler alloys were evaluated from the thermomagnetization measurements. For the Co<sub>2</sub>CrGa, Co<sub>2</sub>MnGa, and Co<sub>2</sub>Mn(Al<sub>1-</sub><i>x</i>Si<i>x</i>) alloys, there was a linear relation between <i>D</i> and <i>T</i><sub>C</sub> . The tendency between <i>D</i> and <i>T</i><sub>C</sub> was different from that for Co<sub>2</sub>Fe(Al<sub>1-</sub><i>x</i>Si<i>x</i>) and Co<sub>2</sub>Fe(Ga<sub>1-</sub><i>x</i>Si<i>x</i>) alloys, that is, <i>T</i><sub>C</sub> was in the temperature region from 1040 to 1100 K indicating weak concentration dependence, whereas <i>D</i> was sensitive to the composition. For example, <i>D</i> changed from 2.28 meV ·nm<sup>2</sup> for <i>x</i>=1 (Co<sub>2</sub>FeSi) to 5.24 meV ·nm<sup>2</sup> for <i>x</i>=0 (Co<sub>2</sub>FeGa) in the case of Co<sub>2</sub>Fe(Ga<sub>1-</sub><i>x</i>Si<i>x</i>) alloys. It was suggested that magnetic stability against the temperature of the Co-based Heusler alloys containing Fe element was governed not only by the spin-wave excitation but also by the other kinds of excitation.