Surface magnetism of NiO investigated by magnetic spectromicroscopies

Mandal, Suman; Das, Jayanta; Menon, Krishnakumar S. R.

doi:10.1016/j.elspec.2015.12.007

Cited by 5 publications

(1 citation statement)

References 62 publications

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“…For the last few decades, soft x-ray magnetic linear dichroism (XMLD) [20] with its elemental specificity and surface sensitivity has become the method of choice for the study of AFM material surfaces and interfaces [21][22][23]. Even though only a few AFM-AFM material systems have been explored so far in the literature, the XMLD method was only used for the study of the CoO-NiO bilayer system [24,25], exploring the magnetic coupling and spin reorientation transition with NiO film thickness.…”

Section: Introductionmentioning

confidence: 99%

Magnetic coupling across the antiferromagnetic–antiferromagnetic interface

Jena¹,

Kar²,

Barman³

et al. 2021

J. Phys. D: Appl. Phys.

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We investigate the magnetic coupling across the antiferromagnetic–antiferromagnetic (AFM–AFM) interface for the prototypical CoO-NiO bilayer system where the bulk Néel temperature (T N ) of NiO is higher than that of CoO. Using the temperature-dependent exchange-scattered electron intensities from the surface AFM lattice, the surface T N of CoO was estimated as a function of the CoO/NiO film thicknesses. Our results show that the surface T N of CoO layers is enhanced significantly from its bulk T N value and approaching the T N of the NiO layers, as the thickness of the CoO layers is reduced to the monolayer limit. Thus, thinner CoO layers are found to have higher T N than thicker layers on NiO, contrasting with the expected finite-size behavior. In addition to the short-range magnetic exchange coupling at the CoO-NiO interface, we observe the existence of a longer-range magnetic coupling across the interface, mediated by the magnetic correlations. Thus, the magnetic proximity effect is attributed to a combination of a short-range and a weaker long-range magnetic coupling, explaining the long AFM order propagation length in AFM–AFM superlattices and bilayers. Further, our results indicate a new approach to tune the AFM Néel temperature by varying the individual layer thickness of the bilayer system through the magnetic proximity effect.

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