Magnetic properties of oblique deposited (FeCoNiNbB)x(SiO2)1-x granular films in a wide x range
Bangmin Zhang, Shihui Ge, Guowei Wang, Yuhua Xiao, Huaping Zuo and Li Zhang
Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University Lanzhou 730000, PRC
Corresponding author: email@example.com
Accepted: 23 December 2009
(Fe57Co24Ni4Nb2B13)x-(SiO2)1-x nano-granular thin films in a wide x range were fabricated by magnetron sputtering by oblique incidence. Excellent soft magnetic properties have been achieved with variable in-plane uniaxial magnetic anisotropy field Hk. For same oblique angle θ, with decreasing x, Hk increases first and reaches maximum at x = 0.88, then decreases; while the coercivity in the easy axis changes slightly and is less than 10 Oe and the resitivity ρ increases monotonously and exhibits a higher rate in x < 0.88. For films with θ = 15°, the sample x = 0.88 possesses a high FMR frequency fr of 5.4 GHz and a large permeability of 40 up to 4.1 GHz. The sample x = 0.66 has both high resistivity and excellent soft magnetic properties, of which the coercivities in hard and easy axes are 3.1 and 2.4 Oe, respectively, Hk is 60 Oe, and ρ reaches 3.1 103 μΩ cm. The magnetic spectrum μ = - shows that is more than 150 below 0.70 GHz and fr reaches 1.70 GHz.
PACS: 61.46.Df – Structure of nanocrystals and nanoparticles (“colloidal” quantum dots but not gate-isolated embedded quantum dots) / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin wave, spin diffusion, dynamic scaling, etc.)
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