Magnetization and Magnetic Microscopy Studies in Fe Thin Films

Jeyaramane, Arout Chelvane; Prasad, Ch. D. V.

doi:10.1007/s11664-020-08647-0

Cited by 1 publication

(1 citation statement)

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“…Both are affected by many factors. Thus, for the free F layer the resonance field depends on the layer's saturation magnetization, surface anisotropy, and uniaxial magnetocrystalline anisotropy [11][12][13]. In the case of F/AF polycrystalline thin films, the structures resonance field is additionally affected by exchange bias due to the exchange interaction with AF spins and by rotatable anisotropy due to the presence of small unstable AF grains in which the AF magnetization rotates irreversibly as the FM magnetization is in rotation [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Magnetization Dynamics in Co/IrMn and Co/FeMn Exchange Biased Structures

Dzhun,

Gerasimenko,

Ezhov

et al. 2023

Magnetochemistry

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Thin film ferromagnet/antiferromagnet (F/AF) exchange biased structures that are widely used in GMR spin valves are considered nowadays as promising systems for antiferromagnetic spintronic and spin-orbitronic devices. Here, the temperature dependences of magnetization dynamics in Co/IrMn and Co/FeMn F/AF structures are investigated using ferromagnetic resonance (FMR) in comparison to a free Co layer. A strong additional decrease in the resonance field was observed in Co/IrMn with a temperature decrease attributed to the rotatable anisotropy increase, which almost vanished at room temperature. In contrast to Co/IrMn, the contribution of the rotatable anisotropy in Co/FeMn is much weaker, even though it exists at RT, it is negative, and slightly varies with the temperature and resonance field shift in Co/FeMn. This is mainly due to unidirectional exchange anisotropy. FMR linewidth for the free Co layer increases with decreasing temperature and is accompanied with a slow relaxation process, while the additional contribution to FMR line broadening in Co/IrMn and Co/FeMn structures is correlated with variation in the exchange anisotropy. The observed results are discussed based on structural and surface morphology and magnetization reversal characterization using X-ray diffraction, atomic force microscopy, and vibrating sample magnetometry data.

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