Dynamic susceptibility on two first-order phase transformations
Abstract
The differential susceptibility of monocrystals in liquid He was measured at 1.64 to 4.2 K with varying magnetic background, magnetic frequency, and the angle in one crystal plane. Anisotropy and critical field strength of the spinflop system CsMnBr3.2H2O were determined as a function of temperature. Assuming a dependence of the activating energy upon the strong coupling in the chains, the relaxation time of the phase transformation was measured (which confirmed the nucleation theory). The axis of preferance in the ac-plane of the metamagnet RbCoCl3.2H2O was unequivocally determined. The angle dependent susceptibility in the phase transformation was explained by the strong anisotropy of the system. The demagnetization factor of an almost ideal spherule was obtained by grinding a crystal. The domain wall relaxation in the phase transformation as a function of the field was investigated. The relaxation time appears minimal in the middle of the transformation and increases when one phase prevails.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1984
- Bibcode:
- 1984PhDT........18T
- Keywords:
-
- Antiferromagnetism;
- Magnetic Permeability;
- Order-Disorder Transformations;
- Phase Transformations;
- Anisotropy;
- Domain Wall;
- Magnetic Dipoles;
- Magnetic Domains;
- Magnetic Flux;
- Magnetic Relaxation;
- Molecular Chains;
- Nucleation;
- Single Crystals;
- Spherules;
- Squid (Detectors);
- Solid-State Physics