Ferromagnetism and coupling between charge carriers and magnetization at room temperature in Ge/MnAs multilayers

Lee, J. J.; Cui, Y.; Song, J. H.; Freeman, A. J.; Ketterson, J. B.; Cho, S. L.
October 2004
Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3169
Academic Journal
Ge/MnAs multilayers are grown on (001) GaAs substrates by molecular-beam epitaxy. All samples investigated showed strong anomalous Hall effects at room temperature with p-type conductivity and temperature-dependent hysteresis loops in the magnetization. Ge/MnAs multilayers also revealed an in-plane magnetic easy axis and a vanishingly small in-plane magnetic anisotropy. These results are in sharp contrast to MnAs/GaAs digital alloys, where the reported Curie temperatures are at or below 50 K, and demonstrate the potential of germanium-based spintronic devices.


Related Articles

  • Asymmetric stochasticity of magnetization reversal dynamics in exchange-biased IrMn/CoFe Film. Lee, Hun-Sung; Ryu, Kwang-Su; You, Chun-Yeol; Jeon, Kun-Rok; Yang, See-Hun; Parkin, Stuart S. P.; Shin, Sung-Chul // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07D731 

    In this study, we investigated the stochastic nature of domain reversal dynamics in exchange-biased IrMn/CoFe film using a time-resolved Kerr microscope. Interestingly, the statistical distributions of the magnetization half-reversal times for both forward and backward applied fields show that...

  • A simplified model of ferromagnetic sheets considering the magnetization dynamics utilizing the saturation wave model. Steentjes, S.; Zirka, S. E.; Moroz, Y. I.; Moroz, E. Y.; Hameyer, K. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17D114-1 

    The usual skin effect observed in magnetically linear medium (l = const.) is absent in a magnetically non-linear medium, leading to wrong predictions of the eddy current field using the classical approach. For this reason, this paper proposes a thin sheet model, improving the eddy current field...

  • Magnetization processes in micron-scale (CoFe/Pt)n multilayers with perpendicular anisotropy: First-order reversal curves measured by extraordinary Hall effect. Diao, Z.; Decorde, N.; Stamenov, P.; Rode, K.; Feng, G.; Coey, J. M. D. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07B538 

    First-order reversal curves (FORCs) were recorded using the extraordinary Hall effect in micron-sized crosses of [Co90Fe10 (0.5 nm)/Pt (1.0 nm)]n multilayers with n = 10, 20, and 50, which exhibit perpendicular magnetic anisotropy. Both the major hysteresis loop and the FORCs are compared to...

  • Size effects on exchange bias in sub-100 nm ferromagnetic–antiferromagnetic dots deposited on prepatterned substrates. Baltz, V.; Sort, J.; Rodmacq, B.; Dieny, B.; Landis, S. // Applied Physics Letters;6/14/2004, Vol. 84 Issue 24, p4923 

    Exchange bias effects have been investigated in ferromagnetic (FM)–antiferromagnetic (AFM) square dots, with lateral sizes of 90 nm, sputtered on a prepatterned Si substrate. The magnetic behavior of the dots has been compared with that of a continuous FM–AFM bilayer with the same...

  • Exchange bias effect of Ge1-xMnxTe with antiferromagnetic MnTe and MnO materials. Lim, S. T.; Hui, Lu; Bi, J. F.; Liew, T.; Teo, K. L. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07C308 

    We have performed exchange biasing of ferromagnetic GeMnTe by an either MnTe or MnO antiferromagnetic overlayer. In the case of GeMnTe/MnTe bilayer, we have observed only an enhancement of coercivity. While in GeMnTe/MnO bilayer, both the hysteresis loop-shift and enhancement of the coercivity...

  • Effect of an in-plane magnetic field on magnetoresistance hysteresis of the two-dimensional electron gas in the integer quantum Hall effect regime. Budantsev, M. V.; Pogosov, A. G.; Bakarov, A. K.; Toropov, A. I.; Portal, J. C. // JETP Letters;Mar2009, Vol. 89 Issue 2, p92 

    Effect of an in-plane magnetic field on the features of the magnetoresistance of a narrow conducting channel placed in the bath of a macroscopic two-dimensional electron gas has been studied. These features are manifested in the hysteretic behavior of the magnetoresistance in the quantum Hall...

  • Exchange bias in [Pt/Co]n/IrMn multilayers with perpendicular magnetic anisotropy. Rhee, Jang Roh // Journal of Applied Physics;5/1/2007, Vol. 101 Issue 9, p09E523 

    An unusual peak in ferromagnetic thickness dependence of exchange bias properties is observed for [Pt(15)/Co(tCo)]4–IrMn(50) (in angstrom) multilayer prepared by magnetron sputtering. The exchange coupling field (Hex) shows the maximum value of 291 Oe for tCo=3 Å. Such atypical...

  • Structure, phase transformation, and magnetic properties of SmCo7-xCrx magnets. Yao, Q.; Liu, W.; Zhao, X. G.; Li, D.; Zhang, Z. D. // Journal of Applied Physics;3/1/2006, Vol. 99 Issue 5, p053905 

    SmCo7-xCrx (x=0–0.6) magnets have been synthesized by mechanical alloying and subsequent annealing. A small amount of Cr favors the formation of Th2Ni17-type 2:17 phase and increasing the Cr content can extend the temperature range in which the hexagonal 2:17 phase remains stable. The...

  • Specific features of unidirectional anisotropy in exchange-coupled DyCo/NiFe film structures. Iskhakov, R. S.; Seredkin, V. A.; Stolyar, S. V.; Yakovchuk, V. Yu.; Frolov, G. I.; Bondarenko, G. V.; Chekanova, L. A.; Polyakov, V. V. // Technical Physics Letters;Jul2008, Vol. 34 Issue 7, p577 

    The dependence of the unidirectional anisotropy in a DyCo/NiFe bilayer system on the thickness of the magnetically soft layer has been studied using dynamic and static techniques. The magnitude of the exchange interaction between layers evaluated using the ferromagnetic resonance method is two...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics