Ordered magnetic phase in Cd1−xMnxTe/Cd1−y−zMgyZnzTe:N heterostructures: magnetooptical studies

Kossacki, P.; Ferrand, D.; Arnoult, Alexandre; Cibert, J.; Tatarenko, S.; Wasiela, A.; d’Aubigné, Y. Merle; Staehli, J. L.; Ganière, Jean‐Daniel; Bardyszewski, W.; Świątek, K.; Sawicki, M.; Wróbel, J.; Dietl, T.

doi:10.1016/s1386-9477(99)00178-2

Cited by 50 publications

(76 citation statements)

References 8 publications

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“…(10), the critical temperature increases with the subband wavefunction, ϕ(z), and magnetic impurities overlap, is proportional to J 2 pd and m * . Similar T c -equation was derived [7] using the RKKY theory and its predictions are in agreement with the measured carrier-induced ferromagnetism in II-VI quantum wells [7,8]. Here we emphasize the role of hole-hole interactions and Mn doping profile on magnetic properties of biased III-V DMS quantum wells.…”

Section: Dms Quantum Wellssupporting

confidence: 82%

Hole–hole correlation effects on magnetic properties of Mn III1−V diluted magnetic semiconductors

Jungwirth

Lee

MacDonald

2001

Physica E: Low-dimensional Systems and Nanostructures

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The mean-field theory represents a useful starting point for studying carrier-induced ferromagnetism in MnxIII1−xV diluted magnetic semiconductors. A detail description of these systems requires to include correlations in the many-body hole system. We discuss the effects of correlations among itinerant carriers on magnetic properties of bulk MnxIII1−xV and magnetic semiconductor quantum wells. Presented results were obtained using parabolic band approximation and we also derive a many-body perturbation technique that allows to account for hole-hole correlations in realistic semiconductor valence bands.

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Section: Dms Quantum Wellssupporting

confidence: 82%

Hole–hole correlation effects on magnetic properties of Mn III1−V diluted magnetic semiconductors

Jungwirth

Lee

MacDonald

2001

Physica E: Low-dimensional Systems and Nanostructures

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“…In this system, the temperature T C at which spontaneous spin splitting of electronic levels appears as well as its temperature dependence [50,54,88,89] follow predictions of a simple mean-field Zener-like model of ferromagnetism [47]. A reasonable accuracy of the mean-field approximation in this low-dimensional system was linked to the long-range character of the ferromagnetic interactions as well as to the combined effects of spin-orbit interaction and confinement that lead to the Ising-type universality class [50].…”

Section: Effects Of Competing Magnetic Interactionsmentioning

confidence: 99%

“…At the same time, however, wide hysteresis loops and the associated spontaneous macroscopic magnetization in zero magnetic field, which are expected within this model [90], have not been observed. Instead, according to polarization-resolved photoluminescence measurements, the global spin polarization of the carrier liquid increases slowly with the external magnetic field along the easy axis, reaching saturation at a field by a factor of twenty greater than what could be accounted for by demagnetization effects [88,89].…”

Section: Effects Of Competing Magnetic Interactionsmentioning

confidence: 99%

High Temperature Ferromagnetism and Nano-Scale Phase Separations in Diluted Magnetic Semiconductors and Oxides

Dietl

2007

Acta Phys. Pol. A

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In this paper the present understanding of the origin of ferromagnetic response that has been detected in a number of diluted magnetic semiconductors and diluted magnetic oxides at room temperature is outlined. It is argued that in these systems, owing to a typically small solubility of magnetic ions, crystallographic or chemical phase separation into regions with a large and a small concentration of magnetic component takes place. The ferromagnetic signatures then come from the regions with a large concentration of magnetic ions, which show non-zero spontaneous magnetization up to the blocking temperature, whose magnitude is proportional to the nanocrystal volume and magnetic anisotropy. Novel methods enabling a control of nano-assembling of magnetic nanocrystals in non-conducting matrices as well as possible functionalities of these spatially modulated magnetic systems are described. We also discuss phase separations into paramagnetic and ferromagnetic regions, which are driven by the Anderson-Mott localization and/or competing ferromagnetic and antiferromagnetic interactions. Finally, the question whether the high temperature ferromagnetism is possible in materials without magnetic ions is addressed.

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“…At the same time, however, wide hysteresis loops and the associated spontaneous macroscopic magnetization in zero magnetic field, which are expected within this model (Lee, Jungwirth and MacDonald, 2002), have not been observed. Instead, according to polarization-resolved photoluminescence measurements, the global spin polarization of the carrier liquid increases slowly with the external magnetic field along the easy axis, reaching saturation at a field by a factor of 20 greater than what could be accounted for by demagnetization effects (Kossacki et al, 2000.…”

Section: Effects Of Competing Magnetic Interactionsmentioning

confidence: 99%

“…The above-mentioned competition between the long-range RKKY merely ferromagnetic interaction and short-range merely antiferromagnetic superexchange was shown to affect in a nontrivial way magnetic properties of modulation-doped p-type (Cd,Mn)Te quantum wells (Kechrakos, Papanikolaou, Trohidou and Dietl, 2005). In this system, the temperature T C at which spontaneous spin splitting of electronic levels appears as well as its temperature dependence Kossacki et al, 2000Kossacki et al, , 2002Boukari et al, 2002) follow predictions of a simple mean-field Zenerlike model of ferromagnetism (Dietl, Haury and Merle d'Aubigné, 1997). A reasonable accuracy of the MFA in this low-dimensional system was linked to the long-range  2006.…”

Section: Effects Of Competing Magnetic Interactionsmentioning

confidence: 99%

Diluted Ferromagnetic Semiconductors—Theoretical Aspects

Dietl

2007

Handbook of Magnetism and Advanced Magnetic Materials

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This chapter reviews theoretical understanding of ferromagnetic response that has been detected in diluted magnetic semiconductors (DMS). Particular attention is paid to those ferromagnetic DMS in which no precipitation of other crystallographic phases has been observed. It is argued that these materials can be divided into three categories. The first consists of (Ga,Mn)As, heavily doped p‐(Zn,Mn)Te, and related compounds. In these solid solutions, the theory built on p–d Zener's model of hole‐mediated ferromagnetism and on either the Kohn‐Luttinger kp theory or the multiorbital tight‐binding approach describes qualitatively, and often quantitatively, thermodynamic, micromagnetic, optical, and transport properties. Moreover, the understanding of these materials has provided a basis for the development of novel methods enabling magnetization manipulation and switching. To the second group, belong compounds in which a competition between long‐range ferromagnetic and short‐range antiferromagnetic interactions and/or the proximity of the localization boundary lead to an electronic nanoscale phase separation that results in characteristics similar to colossal magnetoresistance oxides. Finally, in a number of compounds a chemical nanoscale phase separation into the regions with small and large concentrations of the magnetic constituent is present. Methods of controlling the spinodal decomposition and possible functionalities of these systems are outlined.

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Ordered magnetic phase in Cd1−xMnxTe/Cd1−y−zMgyZnzTe:N heterostructures: magnetooptical studies

Cited by 50 publications

References 8 publications

Hole–hole correlation effects on magnetic properties of Mn III1−V diluted magnetic semiconductors

Hole–hole correlation effects on magnetic properties of Mn III1−V diluted magnetic semiconductors

High Temperature Ferromagnetism and Nano-Scale Phase Separations in Diluted Magnetic Semiconductors and Oxides

Diluted Ferromagnetic Semiconductors—Theoretical Aspects

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