Observation of recoil magnetization curves outside the major loop in Co, Fe, and Ni films

• Autor(a) principal: Geshev, Julian Penkov
• Data de Publicação: 2021
• Outros Autores: Garcia, Wagner Jesus da Silva, Paes, Vagner Zeizer Carvalho, Azeredo, Lucas Felipe Santos de, Dorneles, Lucio Strazzabosco, Andrade, Antonio Marcos Helgueira de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/235093
• topic: Filmes finos magneticos; Histerese magnética; Ferromagnetismo

We report a peculiar magnetization reversal observed in magnetron-sputtered Co, Fe, and Ni films. We found that some recoil (minor) magnetization curves lie entirely and way outside the major loop, a phenomenon referred to here as a recoil-curve overshoot. The greatly enhanced recoil curve’s remanence and coercivity result in an up to 2.5-fold increase of loop’s area. The model of pairs of exchange-coupled grains with misaligned anisotropy axes reproduces, in a very good agreement with the experiment, all key features of the recoil-curve overshoot as well as the kink that some major loops present before saturation. The disclosed features of the ferromagnetic hysteresis provide further insights into this important classical phenomenon.