Physics – Condensed Matter – Materials Science
Scientific paper
2011-05-24
Phys. Rev. B 84, 094434 (2011)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevB.84.094434
We describe a systematic study of the synthesis, microstructure and magnetization of hybrid ferromagnet-semiconductor nanomaterials comprised of MnAs nanoclusters embedded in a p-doped GaAs matrix. These samples are created during the in situ annealing of Be-doped (Ga,Mn)As heterostructures grown by molecular beam epitaxy. Transmission electron microscopy and magnetometry studies reveal two distinct classes of nanoclustered samples whose structural and magnetic properties depend on the Mn content of the initial (Ga,Mn)As layer. For Mn content in the range 5% - 7.5%, annealing creates a superparamagnetic material with a uniform distribution of small clusters (diameter around 6 nm) and with a low blocking temperature (T_B approximately 10 K). While transmission electron microscopy cannot definitively identify the composition and crystalline phase of these small clusters, our experimental data suggest that they may be comprised of either zinc-blende MnAs or Mn-rich regions of (Ga,Mn)As. At higher Mn content (> 8 %), we find that annealing results in an inhomogeneous distribution of both small clusters as well as much larger NiAs-phase MnAs clusters (diameter around 25 nm). These samples also exhibit supermagnetism, albeit with substantially larger magnetic moments and coercive fields, and blocking temperatures well above room temperature.
Rench D. W.
Samarth Nitin
Schiffer Peter
No associations
LandOfFree
Structural and Magnetic Characteristics of MnAs Nanoclusters Embedded in Be-doped GaAs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Structural and Magnetic Characteristics of MnAs Nanoclusters Embedded in Be-doped GaAs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structural and Magnetic Characteristics of MnAs Nanoclusters Embedded in Be-doped GaAs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-515203