Fe3Ga4 is an exciting compound since the helical spin structure (HSS) results in a competition between two ground states - one ferromagnetic (FM) and one antiferromagnetic (AFM). Through this ground state competition, there are multiple magnetic transitions of interest, where one is a metamagnetic transition FM to AFM at 70 K, then an AFM to FM transition at 370 K. The HSS in Fe3Ga4 allows for the metallicity to be retained in the AFM state, which makes this compound a candidate for room temperature AFM spintronic applications and the helimagnetism can support topological skyrmion particles similar to MnSi and FeGe. Axis-dependent magnetoresistance and magnetic measurements will be presented that provide information on the exchange interactions of the spins with respect to field and temperature in single crystal Fe3Ga4. Through these results, important insights have been developed that further the understanding of the unique magnetic structure in Fe3Ga4.
Investigation into the interface formed between Sb2Te3/Ni80Fe20 heterostructures – this is studied using temperature dependent magnetometry, scanning transmission electron microscopy, ferromagnetic resonance, and theoretical support.
The spin state of holes bound to Mn acceptors in GaMnAs is investigated by optical spectroscopy. Concentrations of Mn from 1017 to 1019 cm-3 were studied as a function of magnetic field and temperature. The photoluminescence from recombination of electrons with holes bound in the Mn-acceptor complex (MAC) displays multiple spectral peaks. The circular polarization of these peaks increases with increasing magnetic field and saturates at ρ ≈ 1/3. This value of polarization is expected from modeling the addition of spin angular momentum and interband optical transition matrix elements.
We present a review of our recent resonant inelastic light scattering research of the ultra-high
mobility two-dimensional electron gas in GaAs quantum wells. Spectroscopy of intersubband
excitations shows that exchange interactions are larger than previously anticipated. Light scattering
by large wavevector inter-Landau-level excitations displays the excitonic binding and roton minima
in the mode dispersions that are predicted by Hartree-Fock theories.
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