ICMAGMA 2014
Anti-ferromagnetic ordering in Mn doped copper
oxide nanosheet at low temperature
F. Winfred Shashikanth1, S. Ravi1*
1
*
Department of Physics, Mepco Schlenk Engineering College, Sivakasi 626005, India
Corresponding author’s e-mail:sravi@mepcoeng.ac.in, Tel.: +91-9360534894; Fax: +91-4562-235111
Abstract
We report the anti-ferromagnetic ordering of Mn doped
CuO nanosheet at low temperature. This material exhibit
ferromagnetic behavior at room temperature and at 77 K
it changes to weak ferromagnetism with antiferromagnetic ordering dominates. This may be due to the
suppression of ferromagnetic ordering at 77 K and Morin
temperature lies close of 77 K.
Keywords: Dilute magnetic semiconductor, copper oxide
nanosheet, Mn doping, anti-ferromagnetic ordering
Introduction
Ferromagnetic semiconductors or dilute
magnetic semiconductors (DMS) are key materials
for spin injection in electronic and optoelectronic
semiconductor devices that can be controlled by
weak magnetic field [1]. Generally, oxide based
semiconductors are of much interest since they
have wide bandgap [2]. In the present study, we
synthesized Mn doped copper oxide nanosheet
using a simple chemical route. Their
morphological, optical and magnetic study were
present and discussed.
Experimental
Fig 1 SEM image of Mn doped CuO
Fig 2 Magnetic study of Mn doped CuO at
room temperature and 77 K
In a typical synthesis, appropriate amount of
Cu(NO3)2.3H2O and 0.5% of Mn(NO3)2 were mixed to
obtain a homogenous solution and heated to 220 C for
1 h. To this mixture, appropriate amount of glycine
(0.05 M) is added, which serves as a surfactant and
template. The precipitate was centrifuged and dried at
60 C to obtain the powder.
The magnetic study reveals a hysteresis
loop at room temperature. But at 77 K, the
hysteresis pattern collapses and anti-ferromagnetic
ordering dominates and Morin temperature lies in
the range of 77 K. Further investigation is in
progress.
Result and Discussion
References
XRD and EDS (not shown) confirm the phase
pure formation of Mn doped copper oxide nanosheet.
The SEM image is presented in the Figure 1, which
shows the formation of nanosheets. It also reveals that
the length to width ratio are high confirming the
formation of the 2-D nanostructure. The magnetic study
was performed using Lakeshore VSM 7410. Figure 2
shows the magnetic study of Mn doped copper oxide
nanosheet for room temperature and at 77 K.
[1] S. G. Yang et al. Ferromagnetism in Mn-doped
CuO, App. Phys. Lett. 83 (2003) 3746–3748
[2] S. Ravi, V.S. Prabvin, Nanostructured Copper
Oxide Synthesizedby a Simple Bio-Molecule Assisted
Route with Wide Bandgap, Nanosci. Nanotechnol.
Lett.5 (2013) 879–882.