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Effect of Neutron Irradiation on the EPR Spectra of CuGeO_{3}

100%

Mosiniewicz-Szablewska E., Gładczuk L., Dąbkowska H., Pytel B., Szymczak H.

Acta Physica Polonica A

2000

vol. 97

issue 5

897-900

The influence of neutron irradiation on the electron paramagnetic resonance spectra of the spin-Peierls compound CuGeO_{3} was investigated in the wide temperature range 2-300 K. It was found that the irradiation induced appreciable changes in the EPR signal intensity, resonance line width and g-factor of this material. It was also shown that the irradiation leads to a decrease in the spin-Peierls transition temperature. For higher irradiation doses, an antiferromagnetically ordered phase can be observed at lower temperatures. This phase coexists with the spin-Peierls phase. The observed decrease in the spin-Peierls transition temperature after irradiation may be associated with some changes in topological and chemical short-range order or with the transmutation of the fraction of ^{63}Cu in the ^{63}Cu(n,α)^{60}Co reaction.

Structural Properties of Co and CoFe Electrodes Forming a Magnetic Tunnel Junction

86%

Gładczuk L., Pankowski P., Paszkowicz W., Dłużewski P., Wójcik M., Przysłupski P.

Acta Physica Polonica A

2007

vol. 111

issue 1

135-140

The M_1/MgO/M_2 trilayer tunnel magnetoresistance systems are studied by means of X-ray diffraction, NMR, and transmission electron microscopy techniques. As M_1 and M_2 electrodes we used Co, Fe, and CoFe layers. The growth mechanism and structural quality of both electrodes and of the epitaxial MgO barrier forming the magnetic tunnel junctions are experimentally examined. It is shown that the crystallographic coherence of magnetic tunnel junctions across the MgO barrier is significantly disturbed by imperfect crystal structure of magnetic electrodes. The NMR results indicate a difference in short-range order between bottom and top electrodes.

Effect of Heavy Ion Irradiation on the Magnetic Properties of CuGeO_{3}

73%

Gładczuk L., Mosiniewicz-Szablewska E., Szymczak R., Baran M., Dąbkowska H., Choiński J., Czosnyka T., Szymczak H.

Acta Physica Polonica A

2000

vol. 97

issue 5

871-874

The influence of heavy ion irradiation on the magnetic properties of the spin-Peierls compound CuGeO_{3} has been investigated by means of the electron paramagnetic resonance, the spontaneous magnetization, and the low field ac susceptibility. The measurements were performed on the CuGeO_{3} single crystals before and after irradiation with 80 MeV oxygen ions in the wide temperature range of 2-300 K. It was found that the irradiation induced an increase in the EPR signal intensity, magnetization, and susceptibility of this material. It was also shown that the irradiation does not lead to a decrease in the spin-Peierls transition temperature and to the formation of an antiferromagnetic phase which is expected to appear in disordered spin-Peierls systems.

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3 Acta Physica Polonica A

1 2007

2 2000

3 Gładczuk L.

2 Dąbkowska H.

2 Mosiniewicz-Szablewska E.

2 Szymczak H.

1 Baran M.

1 Choiński J.

1 Czosnyka T.

1 Dłużewski P.

1 Pankowski P.

1 Paszkowicz W.

1 Przysłupski P.

1 Pytel B.

1 Szymczak R.

1 Wójcik M.

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Effect of Neutron Irradiation on the EPR Spectra of CuGeO_{3}

Structural Properties of Co and CoFe Electrodes Forming a Magnetic Tunnel Junction

Effect of Heavy Ion Irradiation on the Magnetic Properties of CuGeO_{3}