Reversible room-temperature ferromagnetism in Nb-doped SrTiO3 single crystals

Abstract

The search for oxide-based room-temperature ferromagnetism has been one of the holy grails in condensed matter physics. Room-temperature ferromagnetism observed in Nb-doped SrTiO3 single crystals is reported in this Rapid Communication. The ferromagnetism can be eliminated by air annealing (making the samples predominantly diamagnetic) and can be recovered by subsequent vacuum annealing. The temperature dependence of magnetic moment resembles the temperature dependence of carrier density, indicating that the magnetism is closely related to the free carriers. Our results suggest that the ferromagnetism is induced by oxygen vacancies. In addition, hysteretic magnetoresistance was observed for magnetic field parallel to current, indicating that the magnetic moments are in the plane of the samples. The x-ray photoemission spectroscopy, the static time-of-flight and the dynamic secondary ion mass spectroscopy and proton induced x-ray emission measurements were performed to examine magnetic impurities, showing that the observed ferromagnetism is unlikely due to any magnetic contaminant.

6 pages, 6 figures

References in corpus (10)

• Magnetic effects at the interface between nonmagnetic oxides
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: The role of oxygen vacancies and electronic reconstruction
• Critical thickness for ferromagnetism in LaAlO3/SrTiO3 heterostructures
• Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
• Carrier-controlled ferromagnetism in SrTiO3
• Reversible room-temperature ferromagnetism in Nb-doped SrTiO3 single crystals
• Magnetic-field induced resistivity minimum with in-plane linear magnetoresistance of the Fermi liquid in SrTiO3-x single crystals
• Reversible metal-insulator transition in LaAlO3 thin films mediated by intragap defects: An alternative mechanism for resistive switching
• Tailoring the electronic properties of SrRuO3 films in SrRuO3/LaAlO3 superlattices

Cited by in corpus (10)

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• Surface magnetism of strontium titanate
• Emerging magnetism and electronic phase separation at titanate interfaces
• Reversible room-temperature ferromagnetism in Nb-doped SrTiO3 single crystals
• Mechanical dissipation from charge and spin transitions in oxygen deficient SrTiO_3
• Bandgap Controlling of the Oxygen-Vacancy-Induced Two-Dimensional Electron Gas in SrTiO3
• Negligible oxygen vacancies, low critical current density, electric-field modulation, in-plane anisotropic and high-field transport of a superconducting Nd0.8Sr0.2NiO2/SrTiO3 heterostructure
• A two-dimensional electron gas based on a 5s oxide with high room-temperature mobility and strain sensitivity
• Room-temperature ferromagnetism in epitaxial bilayer FeSb/SrTiO3(001) terminated with a Kagome lattice
• d-zero Magnetism in Nanoporous Amorphous Alumina Membranes