Abstract
It is shown theoretically, that an antiferromagnetic dielectric with bi-axial anisotropy, such as NiO, can be used for the rectification of linearly-polarized AC spin current. The AC spin current excites two evanescent modes in the antiferromagnet, which, in turn, create DC spin current flowing back through the antiferromagnetic surface. Spin diode based on this effect can be used in future spintronic devices as direct detector of spin current in the millimeter- and submillimeter-wave bands. The sensitivity of such a spin diode is comparable to the sensitivity of modern electric Schottky diodes and lies in the range 102-103 V/W for 30×30 nm2 structure.
Highlights
Recent advances in understanding of fundamental spin-dependent phenomena in solid state put the development of first prototypes of spintronic devices within experimental reach
One of the widely used elements in the modern electronics is a quadratic detector of AC currents, which is often based on a Schottky diode.[1,2]
The quadratic detector performs the rectification of the microwave input signal into the output DC voltage VDC, which is propotional to the power of the input signal PAC
Summary
Recent advances in understanding of fundamental spin-dependent phenomena in solid state put the development of first prototypes of spintronic devices within experimental reach. It was demonstrated that a thin layer of nickel oxide (NiO) – AFM dielectric with bi-axial magnetic anisotropy – can efficiently transfer pure spin currents generated by magnetization precession in an adjacent ferromagnetic layer.[4,5,6]
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