Complex Study of Magnetization Reversal Mechanisms of FeNi/FeMn Bilayers Depending on Growth Conditions

• Published in: Nanomaterials (Basel, Switzerland) Vol. 12; no. 7; p. 1178
• Main Authors: Gritsenko, Christina, Lepalovskij, Vladimir, Volochaev, Mikhail, Komanický, Vladimir, Gorkovenko, Aleksandr, Pazniak, Hanna, Gazda, Maria, Andreev, Nikolai, Rodionova, Valeria
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.04.2022; MDPI
• Subjects: AFM grain size; Anisotropy; Antiferromagnetism; Asymmetry; Bias; Corrosion resistance; exchange bias; exchange spring; Glass substrates; Grain size; Growth conditions; Hysteresis; hysteresis loop asymmetry; Hysteresis loops; Iron compounds; Magnetic measurement; Magnetization reversal; Nickel compounds; substrate temperature; Thickness; Thin films; hysteresis loop asymmetry; exchange spring; AFM grain size; substrate temperature; exchange bias; magnetization reversal
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12071178

Magnetization reversal processes in the NiFe/FeMn exchange biased structures with various antiferromagnetic layer thicknesses (0-50 nm) and glass substrate temperatures (17-600 °C) during deposition were investigated in detail. Magnetic measurements were performed in the temperature range from 80 K up to 300 K. Hysteresis loop asymmetry was found at temperatures lower than 150 K for the samples with an antiferromagnetic layer thickness of more than 10 nm. The average grain size of FeMn was found to increase with the AFM layer increase, and to decrease with the substrate temperature increase. Hysteresis loop asymmetry was explained in terms of the exchange spring model in the antiferromagnetic layer.