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Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System

100%

Barańska M., Dłużewski P., Kret S., Morawiec K., Li T., Sadowski J.

Acta Physica Polonica A

2017

vol. 131

issue 5

1406-1408

The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.

Two-Probe Measurements of Electron Transport in GaN:Si/(Ga,Mn)N/GaN:Si Spin Filter Structures

68%

Kalbarczyk K., Foltyn M., Grzybowski M., Stefanowicz W., Adhikari R., Li T., Kruszka R., Kamińska E., Piotrowska A., Bonanni A., Dietl T., Sawicki M.

Acta Physica Polonica A

2016

vol. 130

issue 5

1196-1198

Results of two-probe magnetoresistance studies in GaN:Si/(Ga,Mn)N/GaN:Si prospective spin filter structures are reported. It is postulated that transport characteristics are strongly influenced by highly conductive threading dislocations and that shrinking of the device size partially mitigates the issue. Simultaneously, maxima at ≈1500 Oe on overall weak, up to 2%, negative magnetoresistance are seen at low temperature, whose origin has been tentatively assigned to effects taking place at the contacts areas.

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2 Acta Physica Polonica A

1 2017

1 2016

2 Li T.

1 Adhikari R.

1 Barańska M.

1 Bonanni A.

1 Dietl T.

1 Dłużewski P.

1 Foltyn M.

1 Grzybowski M.

1 Kalbarczyk K.

1 Kamińska E.

1 Kret S.

1 Kruszka R.

1 Morawiec K.

1 Piotrowska A.

1 Sadowski J.

1 Sawicki M.

1 Stefanowicz W.

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Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System

Two-Probe Measurements of Electron Transport in GaN:Si/(Ga,Mn)N/GaN:Si Spin Filter Structures