Optically Detected Magnetic Resonance Studies of Cd_1-xMn_xTe (x=0.095, 0.007)

Abstract

The dominant mechanism responsible for the optical detection of the Mn2 + magnetic resonance in Cd 1 -x Mn x Te (x = 0.095, 0.007) is explained.By either change of the external magnetic freld or b y setting the conditions for the Mn2 + magnetic resonance, we could change the relative efficiencies of the two competing excitonic recombination processes. By lowering magnetization at the magnetic resonance, recombination via the acceptor bound exciton channel, which is mainly nonradiative, is enhanced. Then, a large up to 50% decrease in the total photoluminescence efficiency was observed in the optically detected magnetic resonance experiment. Such observation allows for verification of the large efficiency of the Auger-type transition responsible for the nonradiative decay of the acceptor bound exciton.

Mechanisms of enhancement of light emission in nanostructures of II–VI compounds doped with manganese

“…High efficiency of such spin-flip interactions was proved experimentally in several systems [20][21][22][23]. Moreover, the sp-d hybridization, postulated in the QCA model, may not be so efficient as was assumed originally.…”

Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions

“…We applied ODMR to identify mechanism(s) responsible for shortening of decay time of Mn 2+ PL [11,14,15,17]. In this study Mn 2+ magnetic resonance was detected optically.…”

“…The so-estimated spin relaxation time is about 37 µs at low excitation density and shortens to 27 µs at increased excitation density. All performed by us investigations indicate that spin-flip interactions between the localized spins of Mn ions and spins/magnetic moments of free carriers are efficient, especially for interactions with the free holes [17]. Theoretical evaluation suggests, however, that such process is not efficient enough to account for observation of Bhargava et al [12].…”

Free Carriers Heating at Mn2+Magnetic Resonance in CdMnTe

“…The large magnitude of the ODMR signal was related to a large efficiency of the Auger type nonradiative recombination of the acceptor bound exciton (ABE) [2], whose recombination is promoted at the magnetic resonance. In this communication we present the results of the ODMR and the optically detected cyclotron resonance (ODCR) experiments performed on 0.7% CdMnTe bulk samples.…”