TY - JOUR
T1 - Characterization of magnetic materials by low-field microwave absorption techniques
AU - Valenzuela, R.
AU - Alvarez, G.
AU - Montiel, H.
AU - Gutiérrez, M. P.
AU - Mata-Zamora, M. E.
AU - Barrón, F.
AU - Sánchez, A. Y.
AU - Betancourt, I.
AU - Zamorano, R.
N1 - Funding Information:
G. Alvarez acknowledges a postdoctoral fellowship from CONACyT-Mexico.
PY - 2008/7
Y1 - 2008/7
N2 - A low-field non-resonant microwave absorption has recently been observed in a variety of magnetically ordered materials at low DC fields (-1000 Oe ≤HDC≤+1000 Oe), which is known as low-field microwave absorption (LFA). It has been shown that LFA is essentially similar to giant magnetoimpedance (GMI), and clearly different from ferromagnetic resonance (FMR). LFA strongly depends on the anisotropy field of the sample. In contrast with FMR (which can be described as the homogeneous precession of spins in the saturated state), LFA can be thought as a spin rotation process occurring during the magnetic saturation. In this work, we present a detailed study of the basic features of LFA in several types of materials: ferrites and amorphous microwires and ribbons; in particular the effects sample shape, temperature up to the Curie transition, the influence of easy axis and the effects of annealings. These examples show that once LFA is fully understood, it can become a powerful characterization tool.
AB - A low-field non-resonant microwave absorption has recently been observed in a variety of magnetically ordered materials at low DC fields (-1000 Oe ≤HDC≤+1000 Oe), which is known as low-field microwave absorption (LFA). It has been shown that LFA is essentially similar to giant magnetoimpedance (GMI), and clearly different from ferromagnetic resonance (FMR). LFA strongly depends on the anisotropy field of the sample. In contrast with FMR (which can be described as the homogeneous precession of spins in the saturated state), LFA can be thought as a spin rotation process occurring during the magnetic saturation. In this work, we present a detailed study of the basic features of LFA in several types of materials: ferrites and amorphous microwires and ribbons; in particular the effects sample shape, temperature up to the Curie transition, the influence of easy axis and the effects of annealings. These examples show that once LFA is fully understood, it can become a powerful characterization tool.
KW - Anisotropy field
KW - Curie transition
KW - Ferromagnetic resonance
KW - Microwave absorption
UR - http://www.scopus.com/inward/record.url?scp=42749090112&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2008.02.008
DO - 10.1016/j.jmmm.2008.02.008
M3 - Artículo
SN - 0304-8853
VL - 320
SP - 1961
EP - 1965
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 14
ER -