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Magnetic Properties of Gd-Substituted Yttrium Nitride

Published online by Cambridge University Press:  26 February 2011

R. B. van Dover ,
L. F. Schneemeyer  and
E. M. Gyorgy
R. B. van Dover
Affiliation:
AT&T Bell Laboratories Murray Hill, NJ 07974
L. F. Schneemeyer
Affiliation:
AT&T Bell Laboratories Murray Hill, NJ 07974
E. M. Gyorgy
Affiliation:
AT&T Bell Laboratories Murray Hill, NJ 07974
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Abstract

Gd2Y1-xN is an instantiation of the broad series of diluted magnetic materials composed of lanthanide nitrides in a Sc, Y or La nitride host. These lanthanoid nitrides are interstitial compounds which all form in the Bi structure and with similar lattice constants, so solid solutions are readily obtained. We have prepared single-crystal thin films by epitaxial growth on sapphire substrates, and obtained material with moderate carrier densities (n Hall∼10 21 cm-3) and mobilities (μHall∼10 cm2V-1sec-1). Below the ordering temperature Tc,∼15 K the GdxY1-x,N films (0.25<x<0.40) exhibit a ferromagnetic-like M-H loop. The saturation magnetization measured at 15 kOe and 4.2 K is anomalously low, representing an effective moment of only 4.2 μB per Gd compared to the expected value of at least 7.2 μB. The piecewise-linear M-H curve is inconsistent with conventional models for a simple anisotropic ferromagnet. These features illustrate some of the unusual properties we are beginning to identify in the behavior of these new materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 89: Symposium Q – Diluted Magnetic (Semimagnetic) Semiconductors , 1986 , 147
Copyright
Copyright © Materials Research Society 1987

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References

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