Tunable Magnetic Skyrmions in Ferrimagnetic Mn\(_4\)N

Thin films of ferrimagnetic Mn\(_4\)N are candidate materials to host magnetic skyrmions that have demonstrated thermal stability up to 450\(^\circ\)C. However, there are no experimental reports observing skyrmions in this system. Here, we discuss the results of sputter grown 15-17~nm Mn\(_4\)N thin...

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Bibliographic Details
Published in:arXiv.org 2021-10
Main Authors: Ma, Chung T, Hartnett, Timothy Q, Zhou, Wei, Balachandran, Prasanna V, Poon, S Joseph
Format: Article
Language:English
Subjects:
Capping
Copper
Density functional theory
Hypothetical particles
Hysteresis loops
Magnesium oxide
Magnetic fields
Magnetic measurement
Magnetic properties
Manganese
Materials selection
Mathematical analysis
Particle theory
Substrates
Thermal stability
Thin films
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Summary:Thin films of ferrimagnetic Mn\(_4\)N are candidate materials to host magnetic skyrmions that have demonstrated thermal stability up to 450\(^\circ\)C. However, there are no experimental reports observing skyrmions in this system. Here, we discuss the results of sputter grown 15-17~nm Mn\(_4\)N thin films on MgO substrate capped with Pt\(_{1-x}\)Cu\(_{x}\) layers. Vibrating sample magnetometry measurement of out-of-plane hysteresis loops confirmed that magnetic properties are insensitive to the cap layer composition. Imaging based on magnetic force microscopy measurements observed 300 to 50~nm sized skyrmions, as the Cu concentration was increased from \(x\) = 0 to 0.9. We performed density functional theory calculations and found that the interfacial Dzyaloshinskii-Moriya interactions (iDMI) follow a trend: Mn\(_4\)N/MgO(001) \(
ISSN:2331-8422
DOI:10.48550/arxiv.2111.00258