Temperature dependence of static and dynamic magnetic properties in NiFe/IrMn bilayer system

Abdulahad, Faris Basheer; Hung, D. S.; Lee, S. F.

doi:10.1557/jmr.2014.108

Cited by 3 publications

(2 citation statements)

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“…The larger grains are magnetically ordered but still unstable that results in the presence of rotatable anisotropy at the absence of exchange bias at RT FMR data and in coercivity increase. At the temperature decrease, these larger grains become stable and begin to contribute to exchange bias instead of H RA ; this leads to H RA decrease and appearance of nonzero H EB [57]. As the temperature further decreases the smaller thermally disordered AF grains become ordered but unstable and begin to contribute to H RA so that the absolute value increases again, as seen in Figure 9b.…”

Section: Discussionmentioning

confidence: 94%

“…As described in [40], the FMR LW, in terms of this process, can be written in the same form as in Equation (5). On the other hand, the presence of the AF layer leads to an additional relaxation process with the Neel relaxation time τ ~exp(∆E/k B T) [36] where ∆E is K AF × V; K AF is AF anisotropy constant (3 × 10 6 erg/cm 3 for FeMn [41] and 5.25 × 10 6 erg/cm 3 for IrMn [57]); and V is the grain volume, which can be roughly evaluated as l 3 where l is the grain size from XRD data. In our case, ∆E FeMn / ∆E IrMn = 1.78, which results in a higher τ for the Co/FeMn sample and, consequently, possibly greater line broadening, even at RT.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 94%