[Co/Pd]4–Co–Pd–NiFe spring magnets with highly tunable and uniform magnetization tilt angles, By Vahid Fallahi

Research

Title	[Co/Pd]4–Co–Pd–NiFe spring magnets with highly tunable and uniform magnetization tilt angles
Type	Article
Keywords	Exchange spring, Tilted spin polarizer, Competing magnetic anisotropy
Researchers	Thi Ngoc Anh Nguyen، Nadjib Benatmane، Vahid Fallahi، Yeyu Fang، Seyed Majid Mohseni Armaki، Randy Kenneth Dumas، Johan Åkerman

Abstract

By varying the Pd thickness (tPd) from 0 to 8 nm in [Co/Pd]4/Co/Pd(tPd)/NiFe exchange springs, we demonstrate (i) continuous tailoring of the exchange coupling between a [Co/Pd]4/Co layer with perpendicular anisotropy, and a NiFe layer with an in-plane easy axis, (ii) tuning of the NiFe out-ofplane magnetization angle from 20J to 80J, and (iii) an up to two-fold increase in the NiFe damping. The partial decoupling also results in a highly uniform NiFe magnetization. These properties make [Co/Pd]4/Co/Pd(tPd)/NiFe spring magnets ideal candidates for use as tilted polarizers, by combining stable and well-defined spin directions of its carriers with a high degree of angular freedom.