用于片上电子自旋共振研究的磁性微晶的捕获
Entrapment of magnetic micro-crystals for on-chip electron spin resonance studies
摘要：
磁性分子的片上电子自旋共振（ESR）需要能够将纳米尺寸的样品精确地定位在电磁场的波腹中以实现最大的磁相互作用。一种方法被开发以在衬底表面上的明确限定的位置中捕获包含自旋的微晶。然后在介观晶体上以34 GHz进行传统的腔ESR测量。多晶稀释的Cr $^{5+}$自旋也被捕获，并在接近ESR灵敏度下限时进行测量。这种方法表明，在稀释制冷机温度下，通过使样品的定位在芯片上的超导腔的顶部的片上ESR测量的可行性。
英文摘要：
On-chip Electron Spin Resonance (ESR) of magnetic molecules requires the ability to precisely position nanosized samples in antinodes of the electro-magnetic field for maximal magnetic interaction. A method is developed to entrap micro-crystals containing spins in a well defined location on a substrate's surface. Traditional cavity ESR measurements are then performed on a mesoscopic crystal at 34 GHz. Polycrystalline diluted Cr$^{5+}$ spins were entrapped as well and measured while approaching the lower limit of the ESR sensitivity. This method suggests the feasibility of on-chip ESR measurements at dilution refrigerator temperatures by enabling the positioning of samples atop an on-chip superconducting cavity.
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