Observation of Combined Ferromagnetic/Paramagnetic Phase in Ga1?xMnxAs by Magnetic Circular Dichroism

Yee, Ki‐Ju; Chakarvorty, R.; Lim, W. L.; Liu, X.; Kutrowski, M.; Titova, Lyubov V.; Wójtowicz, T.; Furdyna, J. K.; Dobrowolska, M.

doi:10.1007/s10948-005-2164-6

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…The authors were able to successfully explain this behavior in a model where the samples were mostly ferromagnetic with about thirty percent of each film remaining paramagnetic. This conclusion is supported by a recent MCD study that also observed ferromagnetic and paramagnetic behavior [135]. However both studies were performed in as-grown films, not in annealed samples.…”

Section: Photoluminescence In Ga 1−x Mn X Assupporting

confidence: 61%

“…[131,2] Numerous explanations were put forward to explain the change in the sign of the MCD as well as the apparent ferromagnetic exchange. [131,133,139,140,135,134] Nonetheless, it should be noted that the original studies spanned a large range of carrier and Mn densities. Furthermore the derivation of the exchange constants as well as the explanations of its sign and doping dependence generally assumed the MCD spectra resulted from a single optical transition (ie: only between two bands).…”

Section: Magneto-opticalmentioning

confidence: 99%

“…Due to the importance of the value of the exchange splitting to models of the ferromagnetism in DMS, the MCD spectra of Ga 1−x Mn x As have been extensively studied as a function of doping and/or temperature. [131,132,133,134,135,129,136,130,137,138] Initially this vast array of experiments produced a range of exchange values −1.0 ≤ N 0 β ≤ 2.5. These initial studies lead some to believe the value of the exchange changed sign with increased Mn concentrations and/or carrier densities.…”

Section: Magneto-opticalmentioning

confidence: 99%

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Optical properties of III-Mn-V ferromagnetic semiconductors

Burch

Awschalom

Basov

2008

Journal of Magnetism and Magnetic Materials

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a b s t r a c tWe review the first decade of extensive optical studies of ferromagnetic, III-Mn-V diluted magnetic semiconductors. Mn introduces holes and local moments to the III-V host, which can result in carrier mediated ferromagnetism in these disordered semiconductors. Spectroscopic experiments provide direct access to the strength and nature of the exchange between holes and local moments; the degree of itineracy of the carriers; and the evolution of the states at the Fermi energy with doping. Taken together, the diversity of optical methods reveal that Mn is an unconventional dopant, in that the metal to insulator transition is governed by the strength of the hybridization between Mn and its p-nictogen neighbor. The interplay between the optical, electronic and magnetic properties of III-Mn-V magnetic semiconductors is of fundamental interest and may enable future spin-optoelectronic devices.

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Section: Photoluminescence In Ga 1−x Mn X Assupporting

confidence: 61%

Section: Magneto-opticalmentioning

confidence: 99%

Section: Magneto-opticalmentioning

confidence: 99%

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Optical properties of III-Mn-V ferromagnetic semiconductors

Burch

Awschalom

Basov

2008

Journal of Magnetism and Magnetic Materials

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“…11 Since the ferromagnetic MCD signal of Co 2+ : ZnO did not resemble that of paramagnetic Co 2+ : ZnO and specifically lacked the 4 A 2 → 4 T 1 ͑P͒ ligand-field feature of substitutional Co 2+ in ZnO, there was speculation that it should be attributed to phase-segregated precipitates. 10 Broad sub-band-gap ferromagnetic MCD features have also been observed in Mn:GaAs, 17 Cr:ZnTe, 18 and Mn:InAs, 19 however, materials for which the intrinsic origins of ferromagnetism are less controversial. We propose that the ferromagnetic MCD signal in Fig.…”

mentioning

confidence: 99%