通过在磁绝缘体中的旋波相互转换传输电信号
Y Kajiwara1, K Harii, S Takahashi
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Nature
|March 12, 2010
概括
研究人员使用旋转霍尔效应在绝缘体中产生和检测自旋波. 这允许电信号通过绝缘体长距离传输,为电子设备提供了新的可能性.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 绝缘体通常会由于大能量带隙而防止电导.
- 电子具有自旋,集体自旋运动 (自旋波) 可以在某些绝缘体中传播信号.
- 旋转波通常使用磁场来激发.
研究的目的:
- 为了证明使用旋-霍尔效应在绝缘体中产生和检测自旋波.
- 为了展示电信号直接转化为自旋波及其在宏观距离上的传输.
- 探索一种用于信号传输的新型混合电力传输方法.
主要方法:
- 利用旋转-哈尔效应将电流直接转换为旋转角运动量.
- 使用/铁石/ (Pt/Y(3) Fe(5) O(12) /Pt) 系统.
- 研究膜与绝缘体Y(3)Fe(5)O(12) 之间的旋转角运动量转移.
主要成果:
- 证据表明,Y(3) Fe(5) O(12) 和膜之间存在旋转角动量转移.
- 通过旋转霍尔效应,实现了金中的电流直接转化为Y(3) Fe(5) O(12) 中的自旋波.
- 一个Pt膜中的电流通过Y(3)Fe(5)O(12) 的自旋波在一个遥远的Pt膜中诱导电压,可以通过磁场进行切换.
结论:
- 旋转波可以通过使用旋转霍尔效应在绝缘体中产生和电气检测.
- 该Y(3)Fe(5)O(12) 绝缘体表现出较弱的旋转阻尼,使得旋转波传输效率高.
- 这种混合电传输方法为电子电路和设备中的信号传输提供了创新潜力.
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