Abstract
The magnetotransport in phase-separated (Ga,Fe)N containing γ′-GayFe4−yN(0<y<1) nanocrystals(NCs) is studied in the temperature range between 2 and 300 K. The evolution of the resistivity and ofthe magnetoresistance (MR) as a function of temperature points to two conduction mechanisms, namely, aconventional Arrhenius-type one down to 50 K and Mott variable range hopping at lower temperatures, wherethe spin-polarized current is transported between NCs in a regime in which phonon-scattering effects are notdominant. Below 25 K, the MR shows a hysteretic contribution at magnetic fields<1 T and proportional to thecoercive field. Anisotropic magnetoresistance with values one order of magnitude greater than those previouslyreported forγ′-Fe4N thin films over the whole considered temperature range confirms that the observed MR inthese layers is determined by the embedded nanocrystals.
| Original language | English |
|---|---|
| Article number | 085201 |
| Pages (from-to) | 085201 |
| Number of pages | 9 |
| Journal | Physical Review B: Condensed Matter and Materials Physics |
| Volume | 99 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2019 |
Fields of science
- 210006 Nanotechnology
- 103 Physics, Astronomy
- 103011 Semiconductor physics
- 103018 Materials physics
- 202032 Photovoltaics
- 103009 Solid state physics
- 103017 Magnetism
JKU Focus areas
- Sustainable Development: Responsible Technologies and Management