Magnetoresistance From Quantum Interference Effects in Ferromagnets

Abstract

The desire to maximize the sensitivity of read/write heads and thus the information density of magnetic storage devices has produced an intense interest in the magnetoresistance (MR) of magnetic materials. Recent discoveries include "colossal" MR of the manganites1-4 and the enhanced MR of low carrier density ferromagnets4-6. In the low carrier density systems investigated to date as well as the manganites, a key feature is that the electrical conduction is due to a different set of electrons than the localized electrons responsible for the magnetism. Here we propose a mechanism for ferromagnetic MR originating from quantum interference effects, rather than simple scattering. The new mechanism obtains in disordered low carrier density magnets where the magnetism as well as the electrical conduction are due to the same electrons. Here the MR is positive and only weakly temperature dependent below the Curie point. This is very different from the MR seen when conduction electrons and local moments can be treated separately, in which case the MR is negative and strongly peaked at the Curie point.

4 pages (HTML) 4 figures (jpeg,gif,png) published in Nature 404 April 6, 2000 581-584

References in corpus (1)

• Spin, Charge, and Bonding in Transition Metal Mono Silicides

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• Metal-insulator transition and magnetism in correlated band insulator: FeSi and Fe${}_{1-x}$Co${}_x$Si
• Enhancing Electron Coherence via Quantum Phonon Confinement in Atomically Thin Nb3SiTe6
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• Magnetic, thermodynamic, and electrical transport properties of the noncentrosymmetric B20 germanides MnGe and CoGe
• A Spin-Mechanical Device for Detection and Control of Spin Current by Nanomechanical Torque
• K and Mn co-doped BaCd2As2: a hexagonal structured bulk diluted magnetic semiconductor with large magnetoresistance
• The Dzyaloshinskii-Moriya interaction is under control: an orchestrated flip of the chiral link between structure and magnetism for Fe${}_{1-x}$Co${}_x$Si
• Magnetic and structural properties of Co${}_2$MnSi based Heusler compound
• Manipulation of the spin helix in FeGe thin films and FeGe/Fe multilayers
• Electron-phonon interaction and spectral weight transfer in Fe${}_{1-x}$Co${}_x$Si
• Linear magnetoresistance in commercial n-type silicon due to inhomogeneous doping
• Enhanced electron correlations in the new binary stannide PdSn4: a homologue of the Dirac nodal arc semimetal PtSn4
• Colossal Positive Magnetoresistance in a Doped Nearly Magnetic Semiconductor
• Electronic Transport in Metallic Systems and Generalized Kinetic Equations
• Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet
• Interesting magnetic properties of Fe${}_{1-x}$Co${}_x$Si alloys
• Quasi-linear magnetoresistance and the violation of Kohler's rule in the quasi-one-dimensional Ta${}_4$Pd${}_3$Te${}_{16}$ superconductor
• Suppressed reflectivity due to spin-controlled localization in a magnetic semiconductor
• Strain-induced effects on the magnetic and electronic properties of epitaxial Fe${}_{1-x}$Co${}_x$Si thin films
• Spin Glass ground state in Mn${}_{1-x}$Co${}_x$Si
• Magnetic-field-induced FM-AFM metamagnetic transition and strong negative magnetoresistance in Mn${}_{1/4}$NbS${}_2$ under pressure
• Weak Ferromagnetism in Fe1-xCoxSb2
• Studying the Magnetic Properties of CoSi Single Crystals
• Magnetic, electronic and transport properties of high-pressure-synthesized chiralmagnets Mn${}_{1-x}$Rh${}_x$Ge (B20)
• Unusual metamagnetism in CeIrIn${}_5$
• Enhanced electron correlations in FeSb${}_2$
• Sr${}_{0.9}$K${}_{0.1}$Zn${}_{1.8}$Mn${}_{0.2}$As${}_2$: a ferromagnetic semiconductor with colossal magnetoresistance
• Resonant Charge Relaxation as a Likely Source of the Enhanced Thermopower in FeSi
• Structural and magnetic properties of E-Fe_{1-x}Co_xSi thin films deposited via pulsed laser deposition
• Symmetry of the Fermi surface and evolution of the electronic structure across the paramagnetic-helimagnetic transition in MnSi/Si(111)
• Possible Scale Invariant Linear Magnetoresistance in Pyrochlore Iridates Bi${}_2$Ir${}_2$O${}_7$
• Optical evidence for heavy charge carriers in FeGe
• Room temperature spin-orbit torque efficiency in sputtered low-temperature superconductor delta-TaN
• Understanding the temperature and pressure dependent electronic properties of FeSi: DFT+DMFT study
• A combined inelastic neutron scattering and \textit{ab initio} lattice dynamics study of FeSi
• Strain-engineered high-temperature ferromagnetic Oxygen-substituted NaMnF3 from first principles
• Information storing by biomagnetites
• de Haas-van Alphen effect and the first-principles study of the possible topological stannide Cu${}_3$Sn
• Resistivity of Mn${}_{1-x}$Fe${}_x$Si single crystals: Evidence for quantum critical behavior
• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si