Semitransparent anisotropic and spin Hall magnetoresistance sensor enabled by spin-orbit toque biasing

Abstract

We demonstrate an ultrathin and semitransparent anisotropic and spin Hall magnetoresistance sensor based on NiFe/Pt heterostructure. The use of spin-orbit torque effective field for transverse biasing allows to reduce the total thickness of the sensors down to 3 - 4 nm and thereby leading to the semitransparency. Despite the extremely simple design, the spin-orbit torque effective field biased NiFe/Pt sensor exhibits level of linearity and sensitivity comparable to those of sensors using more complex linearization schemes. In a proof-of-concept design using a full Wheatstone bridge comprising of four sensing elements, we obtained a sensitivity up to 202.9 mΩ/Oe, linearity error below 5%, and a detection limit down to 20 nT. The transmittance of the sensor is over 50% in the visible range.

References in corpus (5)

• Theory of spin Hall magnetoresistance
• On the origin of field-like spin-orbit torques in heavy metal-ferromagnet-oxide thin film heterostructures
• Microscopic Theory of Rashba Interaction in Magnetic Metal
• Angular dependence of spin-orbit spin transfer torques
• Field-like spin orbit torque in ultra-thin polycrystalline FeMn films

Cited by in corpus (3)

• Eddy Current Testing of Metal Cracks Using Spin Hall Magnetoresistance Sensor and Machine Learning
• Macro-spin Modeling and Experimental Study of Spin-orbit Torque Biased Magnetic Sensors
• Spin Hall magnetoresistance sensor using Au${}_x$Pt${}_{1-x}$ as the spin-orbit torque biasing layer