By Topic

Magneto-Optical and Spin-Transfer Switching Properties of Current-Perpendicular-to Plane Spin Valves With Perpendicular Magnetic Anisotropy

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

10 Author(s)
Ken-ichi Aoshima ; Sci. & Tech. Res. Labs., Japan Broadcasting Corp., Tokyo ; Nobuhiko Funabashi ; Kenji Machida ; Yasuyoshi Miyamoto
more authors

We evaluated the magneto-optical properties of spin-valve (SV) stacks with perpendicular magnets comprised of a Gd-Fe (4-30 nm) free layer and a Tb-Fe-Co/CoFe pinned layer, and the spin-transfer switching properties of current-perpendicular-to-plane (CPP) SVs with the perpendicular magnets. The Gd-Fe free layer had polar Kerr rotation thetask of 0.12deg at a thickness of 10 nm. The thetask reduced with a decrease in GdFe thickness and the sign of thetask switched from positive to negative at a Gd-Fe thickness of 6 nm or thinner. Coercivity (Hc) was maximum and saturation magnetization (Ms) was minimum at a thickness of 8 nm. These phenomena may be explained by an inhomogeneous Gd-Fe composition. The CPP spin valves with the Gd-Fe (10 nm) free layer had a magneto-resistance (MR) of 0.038%. The free layer of a CPP SV device was switched by a pulsed current, which exhibited intrinsic switching current densities of Jc0_P- AP= -3.3times107 A/cm2 and Jc0_ AP-P= 4.3times107 A/cm2 with a thermal stability of 75, which is above the required value of 40. Perpendicular magnets are very useful for obtaining large magneto-optical signals from nano-magnets driven by spin-transfer switching.

Published in:

IEEE Transactions on Magnetics  (Volume:44 ,  Issue: 11 )