Room temperature ferromagnetism (FM) of these thin film samples are highly tuneable by the simultaneous presence of CuO nanophases and multivalent Cu and Vö concentrations.
Systematic
magnetic, electronic, and electrical studies on the
Cu
0.04
Zn
0.96
O/Ga
0.01
Zn
0.99
O cell structure grown on (001) sapphire by the pulsed laser deposition
technique show that the Cu multivalent (Cu
M+
) ions modulate
magnetic and resistive states of the cells. The magnetic moment is
found to be reduced by ∼30% during the high resistance state
(HRS) to low resistance state (LRS) switching. X-ray photoelectron
spectroscopy results reveals an increase of the Cu
+
/Cu
2+
oxidation state ratio (which has been determined by the
relative positions of the Fermi level and the Cu acceptor level) during
the HRS to LRS transition. This decreases the effective spin-polarized
Cu
2+
–V
ö
–Cu
+
channels
and thus the magnetic moment. A conduction mechanism involving the
formation of conductive filaments from the coupling of the Cu
M+
ions and V
ö
has been suggested.
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