Varade Vaibhav, Markus Tal, Vankayala Kiran, Friedman Noga, Sheves Mordechai, Waldeck David H, Naaman Ron
Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel.
Phys Chem Chem Phys. 2018 Jan 3;20(2):1091-1097. doi: 10.1039/c7cp06771b.
We discuss spin injection and spin valves, which are based on organic and biomolecules, that offer the possibility to overcome some of the limitations of solid-state devices, which are based on ferromagnetic metal electrodes. In particular, we discuss spin filtering through bacteriorhodopsin in a solid state biomolecular spin valve that is based on the chirality induced spin selectivity (CISS) effect and shows a magnetoresistance of ∼2% at room temperature. The device is fabricated using a layer of bacteriorhodopsin (treated with n-octyl-thioglucoside detergent: OTG-bR) that is adsorbed on a cysteamine functionalized gold electrode and capped with a magnesium oxide layer as a tunneling barrier, upon which a Ni top electrode film is placed and used as a spin analyzer. The bR based spin valves show an antisymmetric magnetoresistance response when a magnetic field is applied along the direction of the current flow, whereas they display a positive symmetric magnetoresistance curve when a magnetic field is applied perpendicular to the current direction.
我们讨论了基于有机和生物分子的自旋注入和自旋阀，它们有可能克服基于铁磁金属电极的固态器件的一些局限性。特别是，我们讨论了在基于手性诱导自旋选择性（CISS）效应的固态生物分子自旋阀中通过细菌视紫红质进行的自旋过滤，该自旋阀在室温下显示出约2%的磁电阻。该器件是通过将一层细菌视紫红质（用正辛基硫代葡萄糖苷洗涤剂处理：OTG-bR）吸附在半胱胺功能化的金电极上，并覆盖一层氧化镁层作为隧道势垒来制造的，在氧化镁层上放置镍顶电极膜并用作自旋分析仪。当沿电流方向施加磁场时，基于bR的自旋阀显示出反对称磁电阻响应，而当垂直于电流方向施加磁场时，它们显示出正对称磁电阻曲线。
