Title :
Hard-soft GMR sensors with Co-Rh based artificial antiferromagnetic subsystem
Author :
van den Berg, H.A.M. ; Rupp, G. ; Clemens, W. ; Gieres, G. ; Vieth, M. ; Wecker, J. ; Zoll, S.
Author_Institution :
Siemens AG, Erlangen, Germany
fDate :
7/1/1998 12:00:00 AM
Abstract :
The superiority of Rh as antiferromagnetic (AF) coupler in the magnetic rigid Co/Rh/Co subsystem (AAF) of GMR sensors compared to Cu is experimentally demonstrated. It originates in the more than ten times higher coupling strength (Jmax=-5 mJ/m2) of sputtered Co/Rh/Co sandwiches. On Rh/Cu buffers, the relative Rh-thickness window with complete AF coupling is three times larger than of Cu, thus relieving the deposition tolerances. The stability window of the rotating field in angle detectors increases by a factor of two for the Rh-AAF´s. The angular resolution of 0.2° of Rh-sensors is a factor of four better than for their Cu pendants
Keywords :
angular measurement; antiferromagnetic materials; cobalt; exchange interactions (electron); giant magnetoresistance; magnetic sensors; magnetoresistive devices; rhodium; sputtered coatings; Co-Rh-Co; Rh thickness window; Rh/Cu buffer; angle detector; angular resolution; artificial antiferromagnetic subsystem; deposition tolerance; exchange coupling; hard-soft GMR sensor; magnetic rigid subsystem; rotating field; sputtered Co/Rh/Co sandwich; stability window; Antiferromagnetic materials; Couplings; Gas detectors; Giant magnetoresistance; Magnetic anisotropy; Magnetic flux; Magnetic sensors; Magnetoelasticity; Perpendicular magnetic anisotropy; Temperature sensors;
Journal_Title :
Magnetics, IEEE Transactions on
