A (II,Mn)VI diluted magnetic semiconductor quantum dot with an integer number of electrons controlled with a gate voltage is considered. We show that a single electron is able to induce a collective spontaneous magnetization of the Mn spins, overcoming the short range antiferromagnetic interactions, at a temperature order of 1 K, 2 orders of magnitude above the ordering temperature in bulk. The...

Magnetic circular dichroism is used to investigate the evolution of ferromagnetism in the p-type magnetic semiconductor Ga12xMnx As. Local Mn moments and holes produce two spectroscopically distinct contributions, whose properties reveal an antiferromagnetic Mn-hole alignment in the ferromagnetic state. These components are present in both metallic and insulating samples with different temperat...

A GaMnAs nanoelectromechanical resonator is used to obtain the first measurement of magnetostriction in a dilute magnetic semiconductor. Resonance frequency shifts induced by field-dependent magnetoelastic stress are used to simultaneously map the magnetostriction and magnetic anisotropy constants over a wide range of temperatures. Owing to the central role of carriers in controlling ferromagne...

Semiconductor Research Corporation under contract no 2008-KJ-1871 Abstract—The magnetic field in an electron cyclotron resonance plasma processing system was characterized using IEEE standard measurement practices. We discuss methods for a low-cost Hall-effect sensor array construction, calibration, and measurement collection to meet or exceed available standards. Utilizing standard measurement...

We show that the accumulation of spin-polarized electrons at a forward-biased Schottky tunnel barrier between Fe and -GaAs can be detected electrically. The spin accumulation leads to an additional voltage drop across the barrier that is suppressed by a small transverse magnetic field, which depolarizes the spins in the semiconductor. The dependence of the electrical accumulation signal on magn...

Mn-doped diluted magnetic semiconductors are important semiconductor materials and have received much attention due to their application in magnetooptics, spintronics, displays, and lasers. The authors present the magnetic properties of Mn-doped PbSe nanocrystals (NCs) based on electron paramagnetic resonance and superconducting quantum interference device measurements, demonstrating that the e...