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Study of domain wall dynamics in Pt/Co/Pt ultrathin films

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Abstract

Study of the domain wall (DW) dynamics in ultrathin films with perpendicular magnetic anisotropy (PMA) opens the way to envisage the low-power and high-performance memory and logic devices. Here, we have studied the magnetization reversal and DW dynamics of Pt/Co/Pt ultrathin films having PMA. The Pt/Co/Pt ultrathin trilayers have been fabricated using molecular beam epitaxy (MBE) at room temperature. The DW velocity measurements were performed by bubble domain expansion method with an additional homemade coil in order to apply out-of-plane (OOP) field in the polar magneto-optic Kerr effect (P-MOKE)-based microscope. The DW motion is limited only in creep regime, and the maximum observed  DW velocity is 32 mm/s. Further, it has been shown that the DW velocity can be enhanced via increasing Co thickness.

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Acknowledgements

We would like to thank CEFIPRA (IFC/A/5808-1/2017/1395) project for their funding. We also thank Department of atomic energy (DAE), Government of India, for financial support. This project has received funding from the EU H2020 research and innovation programme under grant agreement No 654360 having benefitted from the access provided by Jülich Centre for Neutron Science (JCNS) at the Heinz Maier-Leibnitz Zentrum (MLZ), in Garching, Germany within the framework of the NFFA-Europe. We sincerely thank Prof. Vincent Jeudy for valuable scientific discussion.

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Authors and Affiliations

  1. Laboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Jatni, Odisha, 752050, India

    Minaxi Sharma, Brindaban Ojha, Shaktiranjan Mohanty & Subhankar Bedanta

  2. School of Basic Sciences, Department of Physics, Bahra University Waknaghat, Solan, HP, 173234, India

    Minaxi Sharma

  3. Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85747, Garching, Germany

    Sabine Pütter

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  1. Minaxi Sharma
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  2. Brindaban Ojha
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  3. Shaktiranjan Mohanty
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  4. Sabine Pütter
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  5. Subhankar Bedanta
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Contributions

SB conceived the idea and coordinated the project. SP has prepared the samples. MS has performed the DW dynamics measurements and analysed the data. BO and SM have performed the SQUID measurements and analysed data. SM has performed the XRR measurements and BO has analysed the XRR data using GenX software. The manuscript has mainly been written by MS, BO and SB. All authors contributed to the manuscript corrections.

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Correspondence to Subhankar Bedanta.

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Sharma, M., Ojha, B., Mohanty, S. et al. Study of domain wall dynamics in Pt/Co/Pt ultrathin films. Indian J Phys (2024). https://doi.org/10.1007/s12648-024-03115-5

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