Magnetic coupling across the antiferromagnetic-antiferromagnetic interface

Title

Magnetic coupling across the antiferromagnetic-antiferromagnetic interface

Creator

Jena B.B.; Kar A.; Barman S.; Mandal S.; Menon K.S.R.

Description

We investigate the magnetic coupling across the antiferromagnetic-antiferromagnetic (AFM-AFM) interface for the prototypical CoO-NiO bilayer system where the bulk Nl 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 Nl temperature by varying the individual layer thickness of the bilayer system through the magnetic proximity effect. 2021 IOP Publishing Ltd.

Source

Journal of Physics D: Applied Physics, Vol-54, No. 32

Date

2021-01-01

Publisher

IOP Publishing Ltd

Subject

antiferromagnetism; low-energy electron diffraction; magnetic coupling; thin films

Coverage

Jena B.B., Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata, 700064, India; Kar A., Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata, 700064, India; Barman S., Department of Physics, Raja Peary Mohan College, 1 Acharya Dhruba Pal Road, Uttarpara, Hooghly, West Bengal, 712258, India; Mandal S., Physics and Electronics Department, CHRIST (Deemed to Be University), Bangalore, 560029, India; Menon K.S.R., Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata, 700064, India

Rights

Restricted Access

Relation

ISSN: 223727; CODEN: JPAPB

Format

Online

Language

English

Type

Article

Identifier

https://doi.org/10.1088/1361-6463/ac02fb

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85107871709&doi=10.1088%2f1361-6463%2fac02fb&partnerID=40&md5=1cef7dcf4dadf7dc3ab9bb7f69b430c2