Antiferromagnetic thickness and temperature dependence of the exchange bias properties of Co/IrMn nanodots and continuous films: A Monte Carlo study

Kanso, Haydar; Patte, Renaud; Ledue, D.

doi:10.1016/j.jmmm.2019.165543

Cited by 3 publications

(1 citation statement)

References 48 publications

(73 reference statements)

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“…34 Namely, the relationship T B_EB < T B_SPM ∼ T N is obtained. Notably, the relationship of T B_EB < T B_SPM has been observed in other systems such as Co/ IrMn, 35 Co/Pd multilayer/CoO, 36 and Au/Co/thermally oxidized Cr 2 O 3 , 37 in addition to the above-mentioned Co core -CoO shell NP system. 10 Based on the above results, three temperature regimes were considered.…”

Section: Journal Of Applied Physicsmentioning

confidence: 60%

Temperature lag with the onset of exchange bias, superparamagnetic blocking, and antiferromagnetic ordering in ultrathin ferromagnet/antiferromagnet thin film

Shiratsuchi

Yiran

Tsutsumi

et al. 2021

Journal of Applied Physics

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The magnetization of a nanosized magnet, such as an ultrathin film, thermally fluctuates and can become superparamagnetic. In ferromagnetic/antiferromagnetic thin films, superparamagnetism can be suppressed in accordance with antiferromagnetic ordering. The exchange bias can also be induced at the ferromagnetic/antiferromagnetic interface, and it is nontrivial whether the superparamagnetic blocking temperature (T B_SPM ) can match either the onset temperature of the exchange bias (T B_EB ) or the Néel temperature (T N ). In this study, we investigated the temperature dependence of parameters such as coercivity, exchange bias field, magneto-optic Kerr rotation (θ K ), and AC magnetization (M AC ) to elucidate the matching of T B_EB , T B_SPM , and T N in a Pt/Co/Au/Cr 2 O 3 /Pt thin film. Based on the temperature dependences of M AC , T B_SPM was yielded as about 283 K. T B_EB and T N , which were determined based on the temperature dependence of θ K , were 278 and 282 K, respectively. T B_SPM was almost equal to T N but T B_EB was smaller. This temperature lag was caused by the difference in the magnetic anisotropy energy required to induce the exchange bias and suppress superparamagnetism.

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