Role of interface quality for the spin Hall magnetoresistance in nickel ferrite thin films with bulk-like magnetic properties

Matthias Althammer, Amit Vikram Singh, Tobias Wimmer, Zbigniew Galazka, Hans Huebl, Matthias Opel, Rudolf Gross, Arunava Gupta

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We utilized spin Hall magnetoresistance (SMR) measurements to experimentally investigate pure spin current transport in thin film heterostructures of nickel ferrite (NiFe2O4,NFO) and normal metals (NM) Ta and Pt. We grew (001)-oriented NFO thin films by pulsed laser deposition on lattice-matched magnesium gallate (MgGa2O4) substrates, thereby significantly improving their magnetic and structural properties. We performed SMR measurements at room temperature in patterned Hall bar structures for charge currents applied in the [100]-and [110]-directions of NFO. We found that the extracted SMR magnitude for NFO/Pt heterostructures depends crucially on the Pt resistivity of the investigated Hall bar structure. We further study this resistivity scaling of the SMR effect at different temperatures for NFO/Pt. Our results suggest that the spin mixing conductance of the NFO/Pt interface and the Pt resistivity depend on the interface quality and thus a correlation between these two quantities exists.

Original languageEnglish
Article number092403
JournalApplied Physics Letters
Volume115
Issue number9
DOIs
StatePublished - 26 Aug 2019
Externally publishedYes

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