Observation of Giant Exchange Bias and Topological Hall Effect in Manganese Nitride Films

Abstract

Magnetic and magneto-transport properties of manganese nitride films grown by molecular beam epitaxy have been investigated. Due to the mixed ferrimagnetic (FI) phase ($\epsilon$-phase with TFI ~ 738 K) and the antiferromagnetic phase ($\zeta$-phase with TN ~ 273 K), we observe magnetization hysteresis loops with non-zero exchange bias below TN, reaching ~ 0.22 T at 5 K. This indicates that noncollinear spins exist at the interfaces between two phases, creating a competition between interfacial Dzyaloshinskii-Moriya (DM) and exchange interactions. Strikingly, in addition to the normal Hall effect by Lorentz force and anomalous Hall effect by magnetization, we observe new contribution namely topological Hall effect below 75 K. This verifies the existence of topological spin texture, which is the consequence of competing interactions controlled by both applied field and temperature. Our work demonstrates that spintronic devices may be fabricated exploiting rich magnetic properties of different phases.

arXiv commentthe main text has 18 pages, 4 figures. And the supporting information has 3 pages, 2 figures

References in corpus (8)

• Skyrmion Lattice in a Chiral Magnet
• Anomalous Hall effect
• Interface-Induced Phenomena in Magnetism
• Topological Hall effect and Berry phase in magnetic nanostructures
• Interface-driven topological Hall effect in SrRuO${}_3$-SrIrO${}_3$ bilayer
• Current-Driven Dynamics of Skyrmions Stabilized in MnSi Nanowires Revealed by Topological Hall Effect
• Robust Zero-Field Skyrmion Formation in FeGe Epitaxial Thin Films
• Exchange Bias driven by Dzyaloshinskii-Moriya interactions

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• Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys
• Synthesis of functional nitride membranes using sacrificial water-soluble BaO layers