Title :
Giant magnetostriction of exchange-coupled (TbFe/Fe) ML with high sensitivity after heat treatment
Author :
Le Gall, H. ; Ben Youssef, J. ; Tiercelin, N. ; Preobrazhsensky, V. ; Pernod, P. ; Ostorero, J.
Author_Institution :
Lab. de Magnetisme de Bretagne, CNRS, Brest, France
fDate :
7/1/2001 12:00:00 AM
Abstract :
The possibility to improve the magnetoelastic (ME) properties of exchange-coupled (TbFe/Fe) multilayers (ML) after post-deposition annealing treatment is presented. Giant magnetostriction (GMS) improvement has been observed in highly anisotropic single domain state (SDS) multilayers deposited by ion sputtering under a magnetic polarization field Hd from two points of views corresponding to strong increase of both the magnetoelastic constant bγ,2 by about 75% and the GMS sensitivity dbf/dH, by a factor 6 (bf is the ME parameter of the flexural motion of the (TbFe/Fe)×40/glass bimorph). These improvements have been induced for both the flexion and the torsion motions of the bimorphs submitted to either a static or a dynamical magnetic field which can excite linear and nonlinear anharmonic oscillating modes
Keywords :
annealing; exchange interactions (electron); iron; iron alloys; magnetic anisotropy; magnetic multilayers; magnetoelastic effects; magnetostriction; spin dynamics; terbium alloys; GMS sensitivity; TbFe-Fe; TbFe/Fe ML; anisotropic single domain state multilayers; bimorphs; exchange-coupled ML; flexion motion; flexural motion; giant magnetostriction; ion sputtering; linear anharmonic oscillating modes; magnetic polarization field; magnetoelastic constant; magnetoelastic properties; nonlinear anharmonic oscillating modes; post-deposition annealing treatment; torsion motion; Anisotropic magnetoresistance; Annealing; Iron; Magnetic anisotropy; Magnetic domains; Magnetic multilayers; Magnetic properties; Magnetostriction; Perpendicular magnetic anisotropy; Sputtering;
Journal_Title :
Magnetics, IEEE Transactions on
