Spin waves in two-dimensional ferromagnet with large easy-plane anisotropy |
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| Institution: | 1. Unité de Transplantation Hépatique-Fédération des Spécialités Digestives, Hôpital Edouard Herriot and Université Claude Bernard Lyon 1, Lyon, France;2. Service des Maladies de l''Appareil Digestif et de la Nutrition, Hôpital Claude Huriez Centre Hospitalier Universitaire, Lille, France;3. Unité Médicale de Transplantation Hépatique, AP-HP Hôpital Universitaire Pitié Salpêtrière, Paris, France;4. Service d''Hépato-Gastroenterologie, Hôpital Henri Mondor, Assistance Publique, Hôpitaux de Paris, Créteil, France;5. Hepatology and Liver Intensive Care, INSERM U1149, Hospital Beaujon, Clichy, France;6. Chirurgie Digestive, Endocrinienne et Transplantation Hépatique, Hôpital Trousseau, Tours, France;7. AP-HP Hôpital Paul-Brousse Centre Hépato-Biliaire and INSERM, Unité 1193, Université Paris-Sud, UMR S1193, Villejuif, France |
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| Abstract: | Spin waves in easy-plane two-dimensional ferromagnet when anisotropy is much stronger than exchange are investigated. The spectra of magnons, the spin–spin and quadrupolar correlation functions have been derived. It is shown that in such a system there exist spin waves at low temperatures. Some properties of the quadrupolar ordering in ferromagnets are discussed. |
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