Competition of magneto-dipole, anisotropy and exchange interactions in composite multiferroics

Belemuk, A. M.; Udalov, O. G.; Chtchelkatchev, N. M.; Beloborodov, I. S.

doi:10.1088/0953-8984/28/12/126001

Cited by 8 publications

(3 citation statements)

References 79 publications

(209 reference statements)

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“…This magneto-electric coupling has the Coulomb nature and allows controlling the magnetic state of MTJ. A similar effect was predicted semi-phenomenologically for granular magnets [43][44][45][46].…”

Section: Coulomb Based Exchange Coupling Versus Dielectric Permittivi...supporting

confidence: 82%

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Udalov

Beloborodov

2017

J. Phys.: Condens. Matter

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Section: Coulomb Based Exchange Coupling Versus Dielectric Permittivi...supporting

confidence: 82%

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Udalov

Beloborodov

2017

J. Phys.: Condens. Matter

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Section: Coulomb Based Exchange Coupling Vs Dielectric Permittivity O...supporting

confidence: 81%

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Udalov,

Beloborodov

2016

Preprint

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We study interlayer exchange coupling based on the many-body Coulomb interaction between conduction electrons in magnetic tunnel junction. This mechanism complements the known interaction between magnetic layers based on virtual electron hopping (or spin currents). We find that these two mechanisms have different behavior on system parameters. The Coulomb based coupling may exceed the hopping based exchange. We show that the Coulomb based exchange interaction, in contrast to the hopping based coupling, depends strongly on the dielectric constant of the insulating layer. The dependence of the interlayer exchange interaction on the dielectric properties of the insulating layer in magnetic tunnel junction is similar to magnetoelectric effect where electric and magnetic degrees of freedom are coupled. We calculate the interlayer coupling as a function of temperature and electric field for magnetic tunnel junction with ferroelectric layer and show that the exchange interaction between magnetic leads has a sharp decrease in the vicinity of the ferroelectric phase transition and varies strongly with external electric field.

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“…Physics of granular ferromagnets (GFM) combines numerous phenomena appearing at different length and energy scales. This makes GFM a complicated object suitable for invest igation of fundamental effects and their mutual influence [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Disorder combined with strong Coulomb interaction leads to peculiar dependence of the conductivity of granular metals on temperature [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Coulomb interaction on the exchange coupling in granular magnets

Udalov

Beloborodov

2017

J. Phys.: Condens. Matter

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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.

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Competition of magneto-dipole, anisotropy and exchange interactions in composite multiferroics

Cited by 8 publications

References 79 publications

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Microscopic theory of the Coulomb based exchange coupling in magnetic tunnel junctions

Influence of the Coulomb interaction on the exchange coupling in granular magnets

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