Published October 2020 | Version v1
Journal article Metadata-only

Structural and magneto-transport properties of lattice-mismatched epitaxial Fe/SrO/MgO/Fe magnetic tunnel junctions

Creators

  • 1. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki (Japan)
  • 2. Chiba Institute of Technology, Narashino, Chiba (Japan)

Description

We investigated the structural and magneto-transport properties of Fe/SrO/MgO/Fe magnetic tunnel junctions (MTJs), in which SrO has a large lattice mismatch (Δa/a ∼21%) with Fe. Despite such a large Δa/a, structural analyses revealed that a fully epitaxial Fe(001)/SrO(001)/MgO(001)/Fe(001) structure was successfully formed. We observed high magnetoresistance (MR) ratios up to 98% at 20 K (65% at room temperature), suggesting that coherent spin-polarized tunneling occurs through the SrO(001) tunnel barrier. We also demonstrated that the resistance-area product and bias-voltage (Vhalf), at which the MR ratio reaches half of the zero-bias value, were comparable to the values reported in epitaxial Fe/MgO/Fe MTJs. Since SrO has a smaller Δa/a with Si (∼5%) than that between MgO and Si (∼23%), the results offer that this material is a promising candidate as a high-quality tunnel barrier for Si-based spin transport devices. (author)

Availability note (English)

Available from DOI: https://doi.org/10.35848/1347-4065/abb325

Additional details

Identifiers

DOI
10.35848/1347-4065/abb325;

Publishing Information

Journal Title
Japanese Journal of Applied Physics (Online)
Journal Volume
59
Journal Issue
10
Journal Page Range
p. 103001.1-103001.5
ISSN
1347-4065

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
52097450
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
DISLOCATIONS; ELECTRON DIFFRACTION; KNUDSEN FLOW; LATTICE PARAMETERS; MAGNESIUM OXIDES; MAGNETIC TUNNEL JUNCTIONS; MAGNETORESISTANCE; MOLECULAR BEAM EPITAXY; MOSFET; POLARIZATION; QUATERNARY ALLOY SYSTEMS; STRONTIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOY SYSTEMS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL GROWTH METHODS; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELECTRON MICROSCOPY; EPITAXY; FIELD EFFECT TRANSISTORS; FLUID FLOW; GAS FLOW; LINE DEFECTS; MAGNESIUM COMPOUNDS; MICROSCOPY; MOS TRANSISTORS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SCATTERING; SEMICONDUCTOR DEVICES; STRONTIUM COMPOUNDS; TRANSISTORS; TUNNEL JUNCTIONS

Optional Information

Notes
29 refs., 5 figs., 2 tabs.