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Epitaxial Ferromagnetic MnGa and (MnNi) Ga Thin Films with Perpendicular Magnetization on GaAs

Published online by Cambridge University Press:  03 September 2012

M. Tanaka ,
J.P. Harbison ,
T.D. Sands ,
B.A. Philips ,
J. De Boeck ,
T.L. Cheeks ,
L.T. Florez  and
V.G. Keramidas
M. Tanaka
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
J.P. Harbison
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
T.D. Sands
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
B.A. Philips
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
J. De Boeck
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
T.L. Cheeks
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
L.T. Florez
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
V.G. Keramidas
Affiliation:
Bellcore, 331 Newman Springs Road, Red Bank, NJ 07701–7040.
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Abstract

We have successfully grown thermodynamically stable ferromagnetic MnxGa1-x (x=0.55∼0.60) thin films with thicknesses ranging from 3 nm to 60 nm on GaAs substrates by molecular beam epitaxy. The c-axis of the tetragonal structure of the MnGa film is shown to be aligned perpendicular to the substrate. Both Magnetization Measurements and extraordinary Hall effect measurements indicate perpendicular magnetization of the MnGa films, exhibiting squarelike hysteresis characteristics. Furthermore, we have investigated the effect of Ni additions as a substitution for mn in (Mn60-yNiy) Ga40 alloy thin films with y=0 – 30 at% Ni. With increasing Ni, the perpendicular component of the magnetization becomes smaller up to y=18 where the magnetization is in-plane. At y=30, the magnetization is again perpendicular.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 313: Symposium Q1 – Magnetic Ultrathin Films, Multilayers and Surfaces/Magnetic Interfaces-Physics and Characterizations , 1993 , 507
Copyright
Copyright © Materials Research Society 1993

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References

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