Bolometer detection of magnetic resonances in nanoscaled objects
Bolometer detection of magnetic resonances in nanoscaled objects
复制标题
DOI：
10.1088/0957-4484/25/42/425302
复制
发表时间：
2014-10
期刊：
影响因子：
3.5
通讯作者：
I. Rod;R. Meckenstock;H. Zähres;C. Derricks;F. Mushenok;N. Reckers;P. Kijamnajsuk;U. Wiedwald;M. Farle
中科院分区：
文献类型：
--
作者：
I. Rod;R. Meckenstock;H. Zähres;C. Derricks;F. Mushenok;N. Reckers;P. Kijamnajsuk;U. Wiedwald;M. Farle
我们报告的纳米热电偶（ThC）作为一个温度传感器的高灵敏度测辐射热计探测耗散阻尼的自旋动力学在纳米坡莫合金（Py）条纹。基于Au-Pd ThC的器件通过标准电子束光刻在200 nm氮化硅膜上制造，以使通过衬底的热耗散最小化。我们表明，这种热传感器不仅允许测量的温度变化的顺序上的几个mK由于均匀的共振微波（MW）吸收的Py条纹，但也检测不同的模式数的自旋驻波。使用三维有限元方法，我们估计吸收MW功率的条纹在共振和证明使用基板具有极低的散热，如氮化硅膜成功的热检测的必要性。基于ThC的测辐射热计的电压响应度和噪声等效功率分别等于15 V W−1和3 nW Hz−1/2。ThC器件在真空条件下提供1 nV/（μB W）的磁共振响应，对应于109个自旋的灵敏度和300 μK的温度分辨率。
We report on a nanoscaled thermocouple (ThC) as a temperature sensor of a highly sensitive bolometer for probing the dissipative damping of spin dynamics in nanosized Permalloy (Py) stripes. The Au-Pd ThC based device is fabricated by standard electron beam lithography on a 200 nm silicon nitride membrane to minimize heat dissipation through the substrate. We show that this thermal sensor allows not only measurements of the temperature change on the order of a few mK due to the uniform resonant microwave (MW) absorption by the Py stripe but also detection of standing spin waves of different mode numbers. Using a 3D finite element method, we estimate the absorbed MW power by the stripe in resonance and prove the necessity of using substrates with an extremely low heat dissipation like a silicon nitride membrane for successful thermal detection. The voltage responsivity and the noise equivalent power for the ThC-based bolometer are equal to 15 V W−1 and 3 nW Hz−1/2, respectively. The ThC device offers a magnetic resonance response of 1 nV/(μB W) corresponding to a sensitivity of 109 spins and a temperature resolution of 300 μK under vacuum conditions.