Electron spin resonance in Ge nanowires doped with Mn

Effect of magnetic defects and dimensionality on the spin dynamics of GeMn systems: Electron spin resonance measurements

“…Despite temperature related transformations of lines 1-3, the overall shape of the spectrum remains the same up to T = 300 K. In our previous works we performed a detailed analysis of ESR spectra in DMS NWs and verified that all four lines corresponded to magnetic resonances in different magnetic subsystems. [19][20][21] In particular, we have demonstrated that lines 1 and 2 have the same temperature dependencies and, therefore, may correspond to resonances in the same kind of magnetic defects. It was also shown that the ratio of the integral intensities of lines 1 and 3 and line 2 is similar to the ratio of Mn ions with the oxidation state +3 to those with the state +2.…”

“…Static and dynamic magnetic properties of these structures have been investigated in detail and published elsewhere. 12,15,[19][20][21] The magnetic-resonance spectra have been measured as field dependences of the microwave absorption, dP / dB, in Varian-300 spectrometer at rfs of 9.45 and 24.17 GHz and a modulation frequency of 100 kHz at T = 5 -300 K. Different orientations of the rf magnetic field with a respect to the film plane and the NW long axis have been investigated. The static magnetic field was always kept perpendicular to the rf one.…”

“…2͑a͒, inset͔ has an asymmetric Dyson shape. 21 As temperature increases, the intensity of all resonances decreases. At the same time, the linewidth increases for lines 1-3, remaining unchanged for the line PM͑NW͒ ͑⌬B Ϸ 1 mT͒.…”

“…Perfect dilution of Mn ions in the host accompanied by a high Curie temperature, correlation between electrical and magnetic properties, existence of charge and spin carriers in a magnetically ordered lattice, [19][20][21] and other remarkable features of these systems make them attractive for spintronic applications. Although Ge 1−x Mn x nanowires ͑NWs͒ have a relatively simple and magnetically homogeneous structure consisting of localized ions ͑Mn 3+ and Mn 2+ ͒ and spin-polarized holes, the nature of their ferromagnetism is yet to be understood.…”

Synthesis and temperature dependent photoluminescence properties of Mn doped Ge nanowires

“…In this regard, the doping of magnetic impurity in nanowires can be employed for realizing a 1D DMS system. Although a number of results have been reported on Mn metal doped semiconductor nanowires, [6][7][8][9] the study of optical properties on Mn doped Ge nanowires has not yet been reported. The magnetic and optical properties of nanowires strongly depend on the size of the nanowires and the nature of magnetic impurity.…”