Tuning magnetic interaction between two identical perpendicularly magnetized layers by a nonmagnetic spacer layer

Sahoo, Ajit Kumar and Chelvane, J. Arout and Samardak, A. Yu. and Ognev, A.V. and Samardak, A.S. and Ghosal, Partha and Mohanty, Jyoti Ranjan (2022) Tuning magnetic interaction between two identical perpendicularly magnetized layers by a nonmagnetic spacer layer. Journal of Magnetism and Magnetic Materials, 563. pp. 1-8. ISSN 0304-8853

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Abstract

Tuning magnetic properties of perpendicularly magnetized system is technologically important and have application in modern spintronics devices. In this article, we have considered TbFe based perpendicular trilayer magnetic system by inserting a nonmagnetic spacer layer in between. A systematic variation in thickness of non-magnetic Ti spacer (S) in the trilayer structure, TbFe (40 nm)/ Ti (0, 2, 5, 10, 15, 30 nm)/ TbFe (40 nm) is explored to understand and correlate the structural, magnetic, and microscopic properties of the system. Magnetostatic coupling dominates in these systems, and the strength of the coupling decreases as the S thickness increases. Ti and Fe forms a interfacial TiFe layer, roughness of which increases as the thickness of S increases. The increase in interfacial roughness causes effective magnetization compensation at S = 30 nm, where Hc and Mr are least compared to other spacer thicknesses. However, for S = 2 nm coupling strength was found to be highest compared to other cases, as a result, magnetic domains are compressed. Further increase in thickness of S leads to isolated domains and finally a single domain state is apparent for higher value of S. The experimental findings are supported with in-depth micromagnetic modeling. Kerr microscopy and first-order reversal imaging reveal nucleation and domain wall propagation as the dominated magnetization reversal process in these systems. These microscopic insights and tunability of magnetic properties of the trilayer system may find use in various spintronics applications. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Mohanty, Jyoti Ranjan	https://orcid.org/0000-0001-9579-754X

Item Type:

Article

Additional Information:

A.K.S. would like to thank Indian Institute of Technology Hyderabad for research facility and Ministry of Education for funding. The financial support was provided by Naval Research Board-Defence Research and Development Organization, India through the grant NRB/4003/PG/430 . A.S.S. acknowledges the Russian Ministry of Science and Higher Education for state support of scientific research conducted under the supervision of leading scientists in Russian institutions of higher education , scientific foundations and state research centers (Project No. 075-15-2021-607) for the magnetic domain structure investigation. A.Yu.S. thanks the support of the VSM measurements by the Russian Ministry of Science and Higher Education (Project No. 0657-2020-0013). A.V.O. thanks the Russian Science Foundation (Project 19-72-20071) for the support of Kerr microscope imaging and analysis.

Uncontrolled Keywords:

Interfacial roughness; Magnetic domains; Micromagnetic simulation; Microscopic imaging; Perpendicular magnetic anisotropy

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

28 Sep 2022 13:16

Last Modified:

28 Sep 2022 13:16