Resonant and non-resonant phenomena in measurements of microwave absorption in Co-based amorphous ribbons

 

H. Montiel¹, G. Alvarez², I. Betancourt², R. Valenzuela², R. Zamorano³

 

¹ Centro de Ciencias Aplicadas y Desarrollo Tecnológico de la Universidad Nacional Autónoma de México, México, DF. 04510, México

² Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales de la Universidad Nacional Autónoma de México, México, DF. 04510, México

³ Escuela de Física y Matemáticas del Instituto Politécnico Nacional, México, DF. 07738, México

 

Recibido: 18 de diciembre de 2005.
Aceptado: 31 de agosto de 2006.

 

Abstract

Microwave absorption measurements in X band (9.4 GHz,), were carried out as a function of the transverse dc magnetic field, on as-cast amorphous ribbons of composition Co₆₆Fe₄B₁₂Si₁₃Nb₄Cu prepared by melt spinning. Two different absorptions were observed: one at low dc fields (> 200 Oe) and the other one at high dc fields (< 1800 Oe). The high-field absorption has a resonant character and is associated with ferromagnetic resonance (FMR). The low-field absorption showed non-resonant features (hysteresis, non-Larmor dependence on the dc field) and can be associated with giant magnetoimpedance (GMI); it showed a good agreement when directly compared with GMI measurements. Some additional measurements were performed by rotating the sample's plane with respect to the dc field.

Keywords: Ferromagnetic resonance; Giant magnetoimpedance; Alloys amorphous.

 

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