Tunable three-axis magnetoresistance sensor with a spin-polarised current
Journal
Journal of Physics D-Applied Physics
Journal Volume
48
Journal Issue
40
Pages
405004
Date Issued
2015
Author(s)
Chang, Jui-Hang
Abstract
A three-axis magnetic tunnel junction sensor with three ferromagnetic layers to achieve a linear and hysteresis-free response is proposed and studied analytically. We show that the orientation of the easy axis of the sensor and the sensitivity are tunable by changing the density of a injected spin-polarised current. Additionally, the sensors integrated in a full Wheatstone bridge can have perpendicular and transverse sensing capability in different initial magnetisation arrangements. A value of 0.35% TMR/Oe is observed in sensing the perpendicular field. These findings indicate that a three-axis sensor can be fabricated more easily on a flat substrate.
Type
journal article