Abstract
Nanoparticles of ɛ-Fe2.8Cr0.2N system exhibit the exchange bias phenomenon due to the exchange coupling of the spins of the antiferromagnetic (AF) oxide/oxynitride surface layer and the ferromagnetic (FM) nitride core. Exchange bias is observed at 10 K both in the absence and presence of cooling field. Due to the interface disorder, a mixture of parallel and anti-parallel/perpendicular coupling of the AF and FM spins is observed. The roughness of AF-FM interface induces disorder due to the random exchange anisotropy. The saturation magnetization is also found to be drastically lowered as compared to parent ɛ-Fe3N. Below 58 K, the broad peak (T E ≅ T f ) in zero-field cooled (ZFC) magnetization curves indicates the presence of unidirectional anisotropy and spinglass-like ordering, that arises from the freezing of localized frustrated spins.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S T Oyama, in The chemistry of transition metal carbides and nitrides (Blackie Academic & Professional, New York, 1996)
D L Peng, T J Konno, K Sumiyama, H Onodera and K Suzuki, J. Magn. Magn. Mater. 232–234, 169 (1998)
Ortrud Kubaschewski, in Iron-binary phase diagrams (Springer Verlag, Berlin, 1981) p. 31
J Cieślak, S M Dubiel and B Sepiol, J. Phys.: Condens. Matter 12, 6709 (2000)
N S Gajbhiye and Sayan Bhattacharyya, Jpn. J. Appl. Phys. 46, 980 (2007)
N S Gajbhiye and Sayan Bhattacharyya, J. Appl. Phys. 101, 113902 (2007)
N S Gajbhiye, R S Ningthoujam and Sayan Bhattacharyya, Hyper. Interact. 164, 17 (2005)
N S Gajbhiye and Sayan Bhattacharyya, Hyper. Interact. 165, 147 (2005)
H Mamiya, I Nakatami and T Furubayashi, Phys. Rev. Lett. 84, 6106 (2000)
M Kiwi, J. Magn. Magn. Mater. 234, 584 (2001)
J Nogués and I K Schuller, J. Magn. Magn. Mater. 192, 203 (1999)
J A Mydosh, in Spin glass: An experimental introduction (Taylor & Francis, London, 1993)
J Hanawalt, H Rinn and L Frevel, Anal. Chem. 10, 457 (1938); JCPDS 01-1236
M Robbins and J G White, J. Phys. Chem. Solids 25, 717 (1964)
T M Hong, Phys. Rev. B58, 97 (1998)
D Fiorani, L Del Bianco and A M Testa, J. Magn. Magn. Mater. 300, 179 (2006)
X Lin, A S Murthy, G C Hadjipanayis, C Swann and S I Shah, J. Appl. Phys. 76, 6543 (1994)
Jesús Garcia-Otero, M Porto, J Rivas and A Bunde, Phys. Rev. Lett. 84, 167 (2000)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Gajbhiye, N.S., Bhattacharyya, S. & Sharma, S. Observation of exchange bias and spin-glass-like ordering in ɛ-Fe2.8Cr0.2N nanoparticles. Pramana - J Phys 70, 367–373 (2008). https://doi.org/10.1007/s12043-008-0055-7
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12043-008-0055-7