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2 Acta Physica Polonica A

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EPR Spectra of Multispin Systems. Application to Poly-m-p-Aniline

100%

Juszyński P. , Twardowski A. , Gosk J. , Kulszewicz-Bajer I. , Pawłowski M. , Dziatkowski K. , Szczytko J.

Acta Physica Polonica A

2011

tom 119

nr 5

717-719

In this communication we present NiceMagnetic, software for simulations and analysis of EPR spectrum and SQUID measurements. Systems of arbitrary number N of spin-only magnetic moments (S ≤ 0 and L = 0) were considered within the lines of the Heisenberg and Zeeman Hamiltonians. Effective algorithms used for the computations are discussed. This includes modified secant method adapted to calculate resonance fields with demanded precision. Finally, application of NiceMagnetic to experimental SQUID magnetization and EPR spectra of poly-m-p-aniline, one of recently synthesized high spin polymers containing unpaired electrons will be presented. As a result, exchange integral between electron and nitrogen nuclei spins (ligand hyperfine interaction) J = 6.3 × 10^{-4} cm^{-1} was estimated.

Influence of Epitaxial Strain on Magnetic Anisotropy in (Ga,Mn)As

100%

Juszyński P. , Wasik D. , Gryglas-Borysiewicz M. , Przybytek J. , Szczytko J. , Twardowski A. , Sadowski J.

nr 6

1004-1006

Two (Ga,Mn)As samples having different magnetic anisotropy (one with in-plane easy axis and another one with out-of-plane easy axis) were studied by means of magnetotransport experiments. Anisotropy field B_{A} was determined for both samples as a function of temperature. For the sample having in-plane easy axis, an inversion of the direction of planar Hall effect hysteresis was observed upon increase of temperature. This result was simulated using the Stoner-Wohlfarth model.

On the Question of Ferromagnetism in Proton and He-Irradiated Carbon

100%

Szczytko J. , Juszyński P. , Teliga L. , Twardowski A. , Stonert A. , Ratajczak R. , Korman A.

Acta Physica Polonica A

2008

tom 114

nr 5

1387-1390

We tried to repeat the observation of the ferromagnetic response in proton and He-irradiated carbon made by the group of Esquinazi et al. We used He^+ and H^+ beams focused on graphite sample. The amount of charge deposited in the sample was comparable to the amount of charge used by Esquinazi. Magnetic measurements were performed in SQUID magnetometer. The magnetization of the samples before and after irradiation was compared. We did not observe any ferromagnetic enhancement of magnetization of our irradiated samples. Even if experiment was not the same as Esqinazi's one, we can exclude some of the mechanisms of ferromagnetism proposed by Esquinazi.