Ferromagnet in a continuously tuneable random field
| dc.creator | Silevitch, D. M. | |
| dc.creator | Bitko, D. | |
| dc.creator | Brooke, J. | |
| dc.creator | Ghosh, S. | |
| dc.creator | Aeppli, G. | |
| dc.creator | Rosenbaum, T. F. | |
| dc.date | 2008-01-15 | |
| dc.date.accessioned | 2026-07-07T08:54:37Z | |
| dc.date.available | 2026-07-07T08:54:37Z | |
| dc.description | The Random-Field Ising Model (RFIM) has been extensively studied as a model system for understanding the effects of disorder in magnets. Since the late 1970s, there has been a particular focus on realizations of the RFIM in site-diluted antiferromagnets. We observe random-field effects in the dilute dipole-coupled ferromagnet $\mathrm{LiHo}_x\mathrm{Y}_{1-x}\mathrm{F}_4$. In the presence of a magnetic field transverse to the Ising axis ($H_t$), the behavior of $\mathrm{LiHo}_x\mathrm{Y}_{1-x}\mathrm{F}_4$ becomes increasingly dominated by the influence of random-field terms in the effective Hamiltonian. This is seen experimentally in the shape of the ferromagentic-paramagnetic phase boundary and in changes to the critical exponents near the classical critical point. We find that above the classical critical point the magnetic susceptibility diverges as $H_t\to0$, and that the susceptibility both above and below the classical critical point can be collapsed onto a single universal curve using a modified Curie law which explicitly incorporates random-field contributions. The discovery of a ferromagnetic realization of the RFIM opens the door to investigation of the random-field problem with the wide variety of techniques available for probing ferromagnets, including the ability to examine both the statics and dynamics of the random-field problem. It also allows studying the effects of controlled amounts of randomness on the dynamics of domain pinning and the energetics of domain reversal. | |
| dc.identifier | https://arxiv.org/abs/0801.2335 | |
| dc.identifier | http://arxiv.org/abs/0801.2335 | |
| dc.identifier | Nature v448 567 (2007) | |
| dc.identifier | doi:10.1038/nature06050 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/145999 | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Ferromagnet in a continuously tuneable random field | |
| dc.type | text |