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Published Online: 18 June 2018
Accepted: June 2018

Broadband voltage rectifier induced by linear bias dependence in CoFeB/MgO magnetic tunnel junctions

Appl. Phys. Lett. 112, 252401 (2018); https://doi.org/10.1063/1.5029363
M. Tarequzzaman1,2, A. S. Jenkins1, T. Böhnert1, J. Borme1, L. Martins1, E. Paz1, R. Ferreira1, and P. P. Freitas1,2
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Abstract
In this paper, perpendicular magnetic anisotropy (PMA) is tailored by changing the thickness of the free layer with the objective of producing MTJ nanopillars with a smooth linear resistance dependence with both the in-plane magnetic field and DC bias. We furthermore demonstrate how this linear bias dependence can be used to create a zero-threshold broadband voltage rectifier, a feature which is important for rectification in wireless charging and energy harvesting applications. By carefully balancing the amount of PMA acting in the free layer, the measured RF to DC voltage conversion efficiency can be made as large as 11%.

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