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- Title
Measurement of the Dzyaloshinskii–Moriya Interaction in Mn 4 N Films That Host Skyrmions.
- Authors
Zhou, Wei; Ma, Chung Ting; Poon, S. Joseph
- Abstract
Mn4N thin film is one of the potential magnetic mediums for spintronic devices due to its ferrimagnetism with low magnetization, large perpendicular magnetic anisotropy (PMA), thermal stability, and large domain wall velocity. Recent experiments confirmed the existence of tunable magnetic skyrmions in MgO/Mn4N/CuxPt1−x(x = 0, 0.5, 0.9, 0.95), and density functional theory (DFT) calculation provided a large theoretical value of the interfacial Dzyaloshinskii–Moriya interaction (iDMI) of Mn4N/Pt, which is consistent with the predicted chemical trend of the DMI in transition metal/Pt films. So far, the measured DMI has not been reported in Mn4N, which is needed in order to support the predicted large DMI value. This paper reports the average DMI of MgO/Mn4N(17 nm)/CuxPt1−x(3 nm) extracted from the anomalous Hall effect with various tilted angles, which is based on magnetic droplet theory with DMI effects. The DMI decreases from 0.267 mJ/m2 to 0.011 mJ/m2 with non-linear tendencies as Cu concentration in the CuxPt1−x capping layer increases from 0 to 1, demonstrating the control of the DMI through the CuxPt1−x capping layer. Furthermore, a solid solution model is developed based on an X-ray photoelectron spectroscopy (XPS) compositional depth profile to analyze the possible effects on the DMI from the mixing layers at the surface of Mn4N. After taking into account the mixing layers, the large DMI in Mn4N film with Pt capping is consistent with the predicted DMI.
- Subjects
ANOMALOUS Hall effect; PERPENDICULAR magnetic anisotropy; X-ray photoelectron spectroscopy; DENSITY functional theory; DEPTH profiling
- Publication
Nanomaterials (2079-4991), 2023, Vol 13, Issue 10, p1672
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano13101672