Abstract
The magnetic behaviour and the frequency dependencies of the complex magnetic permeability are studied in a series of heat-treated amorphous and nanocrystalline Fe80.5Nb7B12.5 samples with different volume fractions of the crystalline phase. The magnetic behaviour has been studied by vibrating sample magnetometry (VSM) and by room-temperature hysteresis loop measurements. The spectra of real and imaginary parts of the complex permeability, μ(f) = μ′(f) - jμ″(f), were measured using an impedance analyzer in the frequency range from 0.01 to 10 MHz. The obtained permeability spectra for the investigated nanocrystalline alloys show typical features of a domain wall relaxation dispersion. A marked deterioration of the soft magnetic behaviour takes place in the partially crystallized samples after annealing for 1 h at 803 K. This is reflected by a drastic reduction of permeability and a strong increase of relaxation frequency. An improvement of soft magnetic behaviour characterized by low values of coercivity and relaxation frequency as well as by high permeability is observed after annealing for 1 h at 883 K which resulted in an advanced degree of nanocrystallization in the samples.
| Original language | English |
|---|---|
| Pages (from-to) | 440-442 |
| Number of pages | 3 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 215 |
| DOIs | |
| State | Published - 2 Jun 2000 |
| Event | 14th International Symposium on Soft Magnetic Materials (SMM14) - Balatonfured, Hung Duration: 8 Sep 1999 → 10 Sep 1999 |
Bibliographical note
Funding Information:I. Škorvánek wishes to acknowledge the support of the Austrian FWF under the project M483-PHY. This work was supported in part by the Slovakian VEGA under the projects no. 2/5141 and 2/6064.