Magnetic susceptibility anomalies and inverse magnetic transitions in iron-enriched garnet films

• Published in: Journal of magnetism and magnetic materials Vol. 476; pp. 447 - 452
• Main Authors: Mezin, N.I., Nepochatykh, Yu.I., Starostyuk, N.Yu, Yampolskii, S.V.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2019; Elsevier BV
• Subjects: Anomalies; Cluster solid solution; Dynamic susceptibility; Magnetic fields; Magnetic hysteresis; Magnetic permeability; Magnetic properties; Magnetic transitions; Magnetism; Magnetization; Spontaneous magnetization; Yttrium-iron garnet films; Spontaneous magnetization; Cluster solid solution; Magnetic hysteresis; Yttrium-iron garnet films; Dynamic susceptibility
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2018.12.099

•Anomalous magnetic response of Y3-xFe5+xO12 garnet films was observed.•An additional orientational phase transition was revealed.•Spontaneous magnetization flip in a wide temperature range was detected.•Spontaneous magnetization oscillates in the paramagnetic state of the sample.•Magnetic response of the films exhibits a field and temperature reverse hysteresis. Anomalous properties both of the dynamic magnetic susceptibility and the spontaneous magnetization of Y3-xFe5+xO12 garnet films have been experimentally observed. The most significant anomalies are the following: (a) an orientational magnetic transition at room temperature in the range of the applied magnetic field of 300–700 Oe; (b) a spontaneous magnetization vector reversal in the temperature range of 110–275 °C and the corresponding jump of the dynamic susceptibility at zero magnetic field; (c) oscillations of the magnetization in the paramagnetic state of the sample and the corresponding jumps of the dynamic susceptibility at the planar magnetic field H=200 Oe. It has been established that all reported anomalies exhibit an inverse behavior, namely, with decrease of the applied magnetic field (or temperature) a reverse hysteresis of the field (or temperature) dependences both of the dynamic magnetic susceptibility and the spontaneous magnetization is observed. Possible reasons for such a behavior of the measured dependences are also discussed.