Emergence of Room Temperature Magnetotransport Anomaly in Epitaxial Pt/γ′-Fe4N/MgO Heterostructures toward Noncollinear Spintronics

Xiaohui Shi, Jiawei Jiang, Yadong Wang, Zhipeng Hou, Qiang Zhang, Wenbo Mi, Xixiang Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Noncollinear spin textures have attracted much attention due to their novel physical behaviors in heavy/ferromagnetic metal (HM/FM) systems. The transport anomaly, appearing as contrast humps in Hall resistivity curves, is the mark of noncollinear spin textures. Here, the epitaxial Pt/γ'-Fe4N bilayers with noncollinear spin textures were obtained by facing target sputtering. Large micromagnetic Dzyaloshinskii-Moriya interaction coefficient D of 2.90 mJ/m2 appears in Pt/γ'-Fe4N/MgO systems, which is larger than 2.05 mJ/m2 of Pt/Co/MgO systems with skyrmionic states. Moreover, at 300 K, magnetic bubble-like domains appear in Pt/γ'-Fe4N bilayers that just possess a 3 nm thick ferromagnetic layer instead of [HM/FM]n or [HM1/FM/HM2]n multilayers. Additionally, a room-temperature transport anomaly appears in Pt/γ'-Fe4N/MgO systems. The contrast humps of Pt(3 nm)/γ'-Fe4N(tFe4N ≤ 4 nm)/MgO heterostructures are not sharp due to the nonuniform distributions of the magnetic bubble-like domains with various sizes and irregular shapes, as observed by the magnetic force microscopy. The discovery of epitaxial Pt/γ'-Fe4N bilayers with noncollinear spin states is more crucial than that of polycrystalline or amorphous HM/FM systems for reducing ohmic heating, which provides a candidate for noncollinear spintronic applications.
Original languageEnglish (US)
Pages (from-to)26639-26648
Number of pages10
JournalACS Applied Materials & Interfaces
Volume13
Issue number22
DOIs
StatePublished - May 27 2021

ASJC Scopus subject areas

  • Materials Science(all)

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