Electric field control of magnetization dynamics in ZnMnSe∕ZnBeSe diluted-magnetic-semiconductor heterostructures

Abstract

We show that the magnetization dynamics in diluted magnetic semiconductors can be controlled separately from the static magnetization by means of an electric field. It is important for applications based on DMS to control static and dynamic magnetic properties separately. In II-VI DMS the static and dynamic properties of the Mn spin system

Luminescence studies of spin dynamics in magnetic semiconductor nanostructures

“…Realization of such control has been recently reported for Zn 0.985 Mn 0.015 Se/Zn 0.94 Be 0.06 Se modulation-doped QW [32]. One can see in Fig.…”

Magnetic-field-induced exchange effects between Mn ions and free carriers in ZnSe quantum wells through the intermediate nonmagnetic barrier studied by photoluminescence

“…The obtained data enable us to conclude that the emission bands appearing in the semimagnetic Zn 0. 9 …”

“…However, the presence of magnetic impurities in a QW stimulates spin relaxation processes. [9][10][11] Hence, it is preferable to separate the carriers from the magnetic media. [12][13][14] In this case, the exchange interaction between the free two-dimensional (2D) carriers of a nonmagnetic QW and the ions of magnetic impurities in the barrier is driven by penetration of the carrier wave-function tails into the barrier.…”

Dynamical control of Mn spin-system cooling by photogenerated carriers in a (Zn,Mn)Se/BeTe heterostructure

“…The strong dependence of magnetization dynamics on the Mn concentration, 6 spin diffusion in heteromagnetic semiconductor structures, 7,8 and acceleration of SLR of Mn ions in the presence of free electrons 9,10 have been reported. The free electrons provide an additional channel for spin and energy transfer from the Mn spin system into the phonon bath ͑lattice͒, which can be considerably more efficient than the direct spin-lattice relaxation channel.…”

“…9 The electron concentration, however, can be varied in time domain by, e.g., short and intense laser pulses, as it has been realized in ͑Cd,Mn͒Te/ ͑Cd,Mg͒Te and ͑Zn,Mn͒Se/͑Zn,Be͒Se quantum wells with a type-I band alignment. 11,12 Nevertheless, due to the short recombination time of the photogenerated carriers in these structures it was not possible to reach the condition of the cold carrier system and to clearly detect the effect of the carrier-assisted cooling of the Mn spin system by photogenerated carriers.…”