Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlOx Thin Films

Sankhi, Babu Ram; Lamichhane, Ujjal; Mandal, Soumya; Sachan, Ritesh; Turgut, Emrah; Meyers, Derek

doi:10.3390/magnetochemistry8110154

Open AccessArticle

Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films

by

Babu Ram Sankhi

^1,*

,

Ujjal Lamichhane

¹

,

Soumya Mandal

²,

Ritesh Sachan

²

,

Emrah Turgut

¹ and

Derek Meyers

¹

Department of Physics, Oklahoma State University, Stillwater, OK 74078-3072, USA

²

Department of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078-3072, USA

^*

Author to whom correspondence should be addressed.

Magnetochemistry 2022, 8(11), 154; https://doi.org/10.3390/magnetochemistry8110154

Submission received: 21 October 2022 / Revised: 8 November 2022 / Accepted: 10 November 2022 / Published: 12 November 2022

(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)

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Abstract

We report the dependence of the domain wall depinning field, domain wall velocity, including anisotropy direction, and magnetic properties on the oxidized aluminum thickness of perpendicularly magnetized asymmetric Pt/Co/AlO_x trilayers. We also adopt the low-temperature magneto-transport measurement technique to investigate the amount of oxygen at the Co/AlO_x interface of our magnetic thin films. At the lowest temperature of 25 K, it is found that the coercivity for the 5 nm aluminum thickness sample is very close to the average value and coercivity diminished above and below this critical aluminum thickness, hinting at a large variation in CoO_x content at the interface. This tendency is also consistent with the modification of the depinning fields, coercive fields, and surface roughness measured at room temperature. Our results highlight an efficient way of controlling the depinning fields and other magnetic characteristics, which is important for stabilizing and driving magnetic spin textures and applicable to energy-efficient next-generation spintronics devices.

Keywords: interface; domain walls; perpendicular magnetic anisotropy; magneto-optical Kerr effect; depinning field; skyrmion

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MDPI and ACS Style

Sankhi, B.R.; Lamichhane, U.; Mandal, S.; Sachan, R.; Turgut, E.; Meyers, D. Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films. Magnetochemistry 2022, 8, 154. https://doi.org/10.3390/magnetochemistry8110154

AMA Style

Sankhi BR, Lamichhane U, Mandal S, Sachan R, Turgut E, Meyers D. Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films. Magnetochemistry. 2022; 8(11):154. https://doi.org/10.3390/magnetochemistry8110154

Chicago/Turabian Style

Sankhi, Babu Ram, Ujjal Lamichhane, Soumya Mandal, Ritesh Sachan, Emrah Turgut, and Derek Meyers. 2022. "Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films" Magnetochemistry 8, no. 11: 154. https://doi.org/10.3390/magnetochemistry8110154

APA Style

Sankhi, B. R., Lamichhane, U., Mandal, S., Sachan, R., Turgut, E., & Meyers, D. (2022). Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films. Magnetochemistry, 8(11), 154. https://doi.org/10.3390/magnetochemistry8110154

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Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlO_x Thin Films

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