The Influence of Magnetic Anisotropy on the Kondo Effect and Spin-Polarized Transport through Magnetic Molecules, Adatoms and Quantum Dots

Abstract

Transport properties in the Kondo regime of a nanosystem displaying uniaxial magnetic anisotropy (such as a magnetic molecule, magnetic adatom or quantum dot coupled to a localized magnetic moment) are analyzed theoretically. In particular, the influence of spin-polarized transport through a local orbital of the system and exchange coupling of conduction electrons to the system's magnetic core on the Kondo effect is discussed. The numerical renormalization group method is applied to calculate the spectral functions and linear conductance in the case of the parallel and antiparallel configurations of the electrodes' magnetic moments. It is shown that both the magnetic anisotropy as well as the exchange coupling between electrons tunneling through the conducting orbital and magnetic core play an important role in formation of the Kondo resonance, leading generally to its suppression. Specific transport properties of such a system appear also as a nontrivial behavior of tunnel magnetoresistance. It is also shown that the Kondo effect can be restored by an external magnetic field in both the parallel and antiparallel magnetic configurations.

14 pages with 10 EPS figures (version as accepted for publication in Physical Review B)

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• The numerical renormalization group method for quantum impurity systems
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• The Kondo effect in C${}_{60}$ single-molecule transistors
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• Manual for the Flexible DM-NRG code

Cited by in corpus (18)

• Spintronic magnetic anisotropy
• Transport mirages in single-molecule devices
• Memristive properties of single-molecule magnets
• Temperature dependence of electronic transport through molecular magnets in the Kondo regime
• Spin current and polarization reversal through a single-molecule magnet with ferromagnetic electrodes
• Transverse anisotropy effects on spin-resolved transport through large-spin molecules
• Spin Seebeck effect of correlated magnetic molecules
• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• Intrinsic spin-relaxation induced negative tunnel magnetoresistance in a single-molecule magnet
• Dynamical spin accumulation in large-spin magnetic molecules
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires
• Tunneling anisotropic magnetoresistance in single-molecule magnet junctions
• The graphene sheet versus the 2DEG: a relativistic Fano spin-filter via STM and AFM tips
• Non-Zeeman splitting for a spin-resolved STM with a Kondo adatom in a spin-polarized two-dimensional electron gas
• Local density of states of the interacting resonant level model at zero temperature
• Bosonic Peierls state emerging from the one-dimensional Ising-Kondo interaction
• Negative differential conductance and super-Poissonian shot noise in single-molecule magnet junctions
• Dimensionality effects in the LDOS of ferromagnetic hosts probed via STM: spin-polarized quantum beats and spin filtering