Dilute ferrimagnetic semiconductors in Fe-substituted spinel ZnGa$_2$O$_4
J. Phys.: Condens. Matter 17 (2005) 1003-1010. Solid solutions of nominal composition [ZnGa$_2$O$_4$]$_{1-x}$[Fe$_3$O$_4$]$_x$, of the semiconducting spinel ZnGa$_2$O$_4$ with the ferrimagnetic spinel Fe$_3$O$_4$ have been prepared with $x$ = 0.05, 0.10, and 0.15. All samples show evidence for long-...
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Main Authors | , , , |
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Format | Journal Article |
Language | English |
Published |
06.04.2004
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Subjects | |
Online Access | Get full text |
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Summary: | J. Phys.: Condens. Matter 17 (2005) 1003-1010. Solid solutions of nominal composition
[ZnGa$_2$O$_4$]$_{1-x}$[Fe$_3$O$_4$]$_x$, of the semiconducting spinel
ZnGa$_2$O$_4$ with the ferrimagnetic spinel Fe$_3$O$_4$ have been prepared with
$x$ = 0.05, 0.10, and 0.15. All samples show evidence for long-range magnetic
ordering with ferromagnetic hysteresis at low temperatures. Magnetization as a
function of field for the $x$ = 0.15 sample is S-shaped at temperatures as high
as 200 K. M\"ossbauer spectroscopy on the $x$ = 0.15 sample confirms the
presence of Fe$^{3+}$, and spontaneous magnetization at 4.2 K. The magnetic
behavior is obtained without greatly affecting the semiconducting properties of
the host; diffuse reflectance optical spectroscopy indicates that Fe
substitution up to $x$ = 0.15 does not affect the position of the band edge
absorption. These promising results motivate the possibility of dilute
ferrimagnetic semiconductors which do not require carrier mediation of the
magnetic moment. |
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DOI: | 10.48550/arxiv.cond-mat/0404147 |