| 39202 |
Creator |
3d9f5a6838060f791e133fa6e5265b06 |
| 39202 |
Creator |
ext-0ce9e919fa883094e0b7391f22df9628 |
| 39202 |
Creator |
ext-1d43d4035100ba2ba26f895d95cac734 |
| 39202 |
Creator |
ext-3643af895151be97b069e6774d20a3ad |
| 39202 |
Creator |
ext-54e73d84036cfaec42049e56136596c8 |
| 39202 |
Creator |
ext-564704048bdacc6f4179890ddaf7f8f7 |
| 39202 |
Creator |
ext-5ba1e3e0d29828f769b57231fd127984 |
| 39202 |
Creator |
ext-9b857a28a9160a1c425dcbeeffb95bc2 |
| 39202 |
Date |
2014-01 |
| 39202 |
Is Part Of |
p00189464 |
| 39202 |
Is Part Of |
repository |
| 39202 |
abstract |
We report systematic investigations on structural, magnetic and optical properties
of NiO nanoparticles prepared by mechanical alloying. As-milled powders exhibit face
centred cubic structure, but average particle size decreases and effective strain
increases for the initial periods of milling. Lattice volume increases monotonically
with a reduction in particle size. Antiferromagnetic NiO particles exhibit significant
room temperature (RT) ferromagnetism with modest moment and coercivity. A maximum
moment of 0.0147 μ<sub>Β</sub>/f.u at 12 kOe applied field and a coercivity of 160
Oe were obtained for 30 h milled NiO powder. Exchange bias decreases linearly with
a decrease in NiO particle size. Thermo-magnetization data reveal the presence of
mixed magnetic phases in milled powders and shifts magnetic phase transition towards
high temperature with increasing milling. Annealing of milled NiO powder and photoluminescence
studies show a large reduction in RT magnetic moment and blue-shifting of band edge
emission peak. The observed properties are discussed on the basis of finite size effect,
defect density, oxidation/reduction of Ni, increase in number of sublattices, uncompensated
spins from surface to particle core, and interaction between uncompensated surfaces
and particle core with lattice expansion. |
| 39202 |
authorList |
authors |
| 39202 |
issue |
1 |
| 39202 |
status |
peerReviewed |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210632 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210633 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210638 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210639 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210640 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/210641 |
| 39202 |
uri |
http://data.open.ac.uk/oro/document/211804 |
| 39202 |
volume |
50 |
| 39202 |
type |
AcademicArticle |
| 39202 |
type |
Article |
| 39202 |
label |
Kisan, Bhagaban; Shyni, P. C.; Layek, Samar; Verma, H. C.; Hesp, David; Dhanak,
Vinod; Krishnamurthy, Satheesh and Perumal, A. (2014). Finite size effects in magnetic
and optical properties of antiferromagnetic NiO nanoparticles. IEEE Transactions
on Magnetics, 50(1), article no. 2300704. |
| 39202 |
label |
Kisan, Bhagaban; Shyni, P. C.; Layek, Samar; Verma, H. C.; Hesp, David; Dhanak, Vinod;
Krishnamurthy, Satheesh and Perumal, A. (2014). Finite size effects in magnetic
and optical properties of antiferromagnetic NiO nanoparticles. IEEE Transactions
on Magnetics, 50(1), article no. 2300704. |
| 39202 |
Title |
Finite size effects in magnetic and optical properties of antiferromagnetic NiO nanoparticles |
| 39202 |
in dataset |
oro |