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Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods

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Teich L., Schröder C., Müller C., Patel A., Meyer J., Hütten A.

Acta Physica Polonica A

2015

vol. 127

issue 2

374-376

We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.

Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime

100%

Wojtowicz T., Dobrowolska M., Furdyna J., Meyer J., Bartoli F., Hoffman C., Ram-Mohan L.

Acta Physica Polonica A

1991

vol. 80

issue 2

245-254

We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field.

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2 Acta Physica Polonica A

1 2015

1 1991

2 Meyer J.

1 Bartoli F.

1 Dobrowolska M.

1 Furdyna J.

1 Hoffman C.

1 Hütten A.

1 Müller C.

1 Patel A.

1 Ram-Mohan L.

1 Schröder C.

1 Teich L.

1 Wojtowicz T.

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Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods

Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime