2013
DOI: 10.1088/0953-8984/25/19/196005
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Formation of two-dimensionally confined superparamagnetic (Mn, Ga)As nanocrystals in high-temperature annealed (Ga, Mn)As/GaAs superlattices

Abstract: The annealing-induced formation of (Mn,Ga)As nanocrystals in (Ga,Mn)As/GaAs superlattices was studied by X-ray diffraction, transmission electron microscopy and magnetometry. The superlattice structures with 50Å thick (Ga,Mn)As layers separated by 25, 50 and 100Å thick GaAs spacers were grown by molecular beam epitaxy at low temperature (250 o C), and then annealed at high temperatures of: 400, 560 and 630 o C. The high temperature annealing causes decomposition to GaMnAs ternary alloy and formation of (Mn,Ga)… Show more

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Cited by 6 publications
(6 citation statements)
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“…From an application viewpoint particularly relevant is the preparation of magnetically active NCs that reside in a predefine plane. This can be achieved by growing appropriately thin (Ga,Mn)As layers, in which Mn-rich NCs gather after annealing below 600 • C (Sadowski et al, 2013;, as shown in Fig. 15.…”
Section: Niddamentioning
confidence: 99%
See 1 more Smart Citation
“…From an application viewpoint particularly relevant is the preparation of magnetically active NCs that reside in a predefine plane. This can be achieved by growing appropriately thin (Ga,Mn)As layers, in which Mn-rich NCs gather after annealing below 600 • C (Sadowski et al, 2013;, as shown in Fig. 15.…”
Section: Niddamentioning
confidence: 99%
“…Cross-sectional STEM (scanning transmittance electron microscope) image of the region close to the GaAs(001) substrate of a GaAs/(Ga,Mn)As superlattice with Mn content of 3.7% annealed at 560 • C. Adapted fromSadowski et al, 2013. …”
mentioning
confidence: 99%
“…4,5 Such nanocomposites containing metallic magnetic nanostructures, have a potential for applications in electronics, spintronics, photovoltaics, plasmonics, and thermoelectrics. 5 Methods have been elaborated to position the nanocrystals in predefined planes, 6,7 to impose lateral order, 8 and to fabricate nanocrystals in a form of dense nanocolumn arrays extending across the film thickness. 5,9 We study here the case of the near surface region of GaN doped with Fe, obtained by metal-organic vapour phase epitaxy (MOVPE).…”
Section: Introductionmentioning
confidence: 99%
“…In this paper we present the off-axis electron holography approach to the study of the magnetic behavior of Mn rich nanoprecipitates embedded in (Mn,Ga)As matrix [18,19]. The sample is tested both at room temperature (RT) and at low temperatures.…”
Section: Introductionmentioning
confidence: 99%
“…Many nanostructures, such as nanowires [8,9,10], nanocubes [11,12], nanospheres [13,14], nanoparticles [15,16] or nanorings [17] have been investigated by means of electron holography in view of their magnetic nature. In this paper we present the off-axis electron holography approach to the study of the magnetic behavior of Mn rich nanoprecipitates embedded in (Mn,Ga)As matrix [18,19]. The sample is tested both at room temperature and at low temperatures.…”
Section: Introductionmentioning
confidence: 99%