Influence of the Coulomb interaction on the exchange coupling in granular magnets
arXiv:1606.02622 · doi:10.1088/1361-648X/aa6181
Abstract
We develop a theory of the exchange interaction between ferromagnetic (FM) metallic grains embedded into insulating matrix by taking into account the Coulomb blockade effects. For bulk ferromagnets separated by the insulating layer the exchange interaction strongly depends on the height and thickness of the tunneling barrier created by the insulator. We show that for FM grains embedded into insulating matrix the exchange coupling additionally depends on the dielectric properties of this matrix due to the Coulomb blockade effects. In particular, the FM coupling decreases with decreasing the dielectric permittivity of insulating matrix. We find that the change in the exchange interaction due to the Coulomb blockade effects can be a few tens of percent. Also, we study dependence of the intergrain exchange interaction on the grain size and other parameters of the system.
14 pages, 8 figures
References in corpus (9)
- All-optical control of ferromagnetic thin films and nanostructures
- Coupling of (ferro)electricity and magnetism through Coulomb blockade in Composite Multiferroics
- Interplay of Coulomb Blockade and Ferroelectricity in Nano-Granular Materials
- Electric field control of magnetic properties and magneto-transport in composite multiferroics
- Absence of the Ordinary and Extraordinary Hall effects scaling in granular ferromagnets at metal-insulator transition
- Influence of the Coulomb interaction on the exchange coupling in granular magnets
- Proximity coupling of granular film with ferroelectric substrate and giant electro-resistance effect
- Electron Transport Properties of Composite Ferroelectrics
- Electron Transport in Nanogranular Ferromagnets
Cited by in corpus (4)
- Influence of the Coulomb interaction on the exchange coupling in granular magnets
- Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions
- Magneto-electric effect in doped magnetic ferroelectrics
- Influence of image forces on the interlayer exchange interaction in magnetic tunnel junctions with ferroelectric barrier