Spectroscopic investigation of elastic and magnetoelastic properties of CoFeB thin films. (10th March 2016)

• Record Type: Journal Article
• Authors: Gueye, M; Zighem, F; Belmeguenai, M; Gabor, M S; Tiusan, C; Faurie, D
• Is Part Of: Journal of physics. Volume 49:Number 14(2016)
• Publication Date: 2016-03-10
• Subjects: ferromagnetic resonance -- magnetoelastic anisotropy -- flexible systems; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/14/145003
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Magneto-stress coupling has been studied in Co20 Fe60 B20 thin films of varying thicknesses (10, 20 and 250 nm) deposited onto flexible substrate. It has been investigated by measuring the magnetic resonance under uniaxial (tensile or compressive) applied stresses in situ . The benchmark state, in terms of elastic and magnetic properties, was studied by combining Brillouin light scattering experiments and magnetic resonance experiments on flat samples. The deduced parameters are thickness-independent and close to the ones obtained using rigid substrates. A large uniaxial anisotropy proportional to the applied uniaxial stress is found, which is well fitted by considering an isotropic saturation magnetostriction coefficient. Finally, the angular dependence of the resonance field with in-plane biaxial stresses is probed and explained using a simple analytical model.