Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10710580 | Journal of Magnetism and Magnetic Materials | 2005 | 4 Pages |
Abstract
We present ferromagnetic resonance (FMR) measurements on â¼3 nm amorphous magnetic nanoparticles of Co-Ni-B as a function of temperature (T). The particles were studied in powder form and dispersed in a polymer matrix to study the interparticle interaction effect. In both samples the FMR responses are similar down to Tâ¼10 K, where the powder sample shows an intensity increase not followed by the dispersed sample. We argue that the general characteristics are compatible with previous magnetization measurements and Monte Carlo simulations indicating large surface contributions to the effective anisotropy. In this case the frustration of the single-particle behavior observed in the powder sample at very low T (T ⩽ 10 K) is due to interparticle interactions.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
E. De Biasi, R.D. Zysler, C.A. Ramos, H. Romero,