Spin textures and random fields in dirty quantum hall ferromagnets
Dirty quantum Hall ferromagnets (QHFMs) provide a setting both for new problems in the theory of magnetism with quenched disorder, and for new realisations of old problems. In the first category, the fact that spin textures in Heisenberg QHFMs carry charge leads to a coupling between charged impurit...
| Main Author: | |
|---|---|
| Format: | Conference item |
| Published: |
2006
|
| _version_ | 1797090668090228736 |
|---|---|
| author | Chalker, J |
| author_facet | Chalker, J |
| author_sort | Chalker, J |
| collection | OXFORD |
| description | Dirty quantum Hall ferromagnets (QHFMs) provide a setting both for new problems in the theory of magnetism with quenched disorder, and for new realisations of old problems. In the first category, the fact that spin textures in Heisenberg QHFMs carry charge leads to a coupling between charged impurities and magnetic order. This coupling drives a zero-temperature transition between a ferromagnet at low disorder and a spin glass at strong disorder, and controls screening and the nature of excitations in the disorder-dominated ground state. In the second category, random fields coupling linearly to the order parameter appear in some Ising QHFMs, and transport measurements appear to indicate field-induced domain states at low temperature. |
| first_indexed | 2024-03-07T03:21:59Z |
| format | Conference item |
| id | oxford-uuid:b7bc1a23-4fd2-42d6-8956-6e4c26b9cd05 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:21:59Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:b7bc1a23-4fd2-42d6-8956-6e4c26b9cd052022-03-27T04:50:54ZSpin textures and random fields in dirty quantum hall ferromagnetsConference itemhttp://purl.org/coar/resource_type/c_5794uuid:b7bc1a23-4fd2-42d6-8956-6e4c26b9cd05Symplectic Elements at Oxford2006Chalker, JDirty quantum Hall ferromagnets (QHFMs) provide a setting both for new problems in the theory of magnetism with quenched disorder, and for new realisations of old problems. In the first category, the fact that spin textures in Heisenberg QHFMs carry charge leads to a coupling between charged impurities and magnetic order. This coupling drives a zero-temperature transition between a ferromagnet at low disorder and a spin glass at strong disorder, and controls screening and the nature of excitations in the disorder-dominated ground state. In the second category, random fields coupling linearly to the order parameter appear in some Ising QHFMs, and transport measurements appear to indicate field-induced domain states at low temperature. |
| spellingShingle | Chalker, J Spin textures and random fields in dirty quantum hall ferromagnets |
| title | Spin textures and random fields in dirty quantum hall ferromagnets |
| title_full | Spin textures and random fields in dirty quantum hall ferromagnets |
| title_fullStr | Spin textures and random fields in dirty quantum hall ferromagnets |
| title_full_unstemmed | Spin textures and random fields in dirty quantum hall ferromagnets |
| title_short | Spin textures and random fields in dirty quantum hall ferromagnets |
| title_sort | spin textures and random fields in dirty quantum hall ferromagnets |
| work_keys_str_mv | AT chalkerj spintexturesandrandomfieldsindirtyquantumhallferromagnets |