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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13498
Title: Anisotropic super-paramagnetism in cobalt implanted rutile-TiO2 single crystals
Authors: Joshi S.R.
Padmanabhan B.
Chanda A.
Shukla N.
Malik, Vivek K.K.
Kanjilal D.
Varma S.
Published in: Journal of Magnetism and Magnetic Materials
Abstract: The present study investigates the magnetic properties of single crystal rutile TiO2 (110) implanted with cobalt ions for fluences between 5 × 1016 and 1 × 1017 ions/cm2 with energy of 200 keV. The temperature and field dependent magnetization for magnetic fields along [0 0 1] and [11¯0] directions of the as implanted TiO2 crystals show anisotropic super-paramagnetic behaviour due to formation of Co (hcp) nano-clusters unlike the complete ferromagnetic behaviour from previous reports. The ZFC and FC magnetization curves show a much higher blocking temperature (TB) along [11¯0] with values ranging from 30 to 150 K, while for field along [0 0 1] shows a lower TB ranging from 8 to 70 K. The magnetization isotherms above TB show a sharper rise and universal scaling behaviour, for field along [11¯0] direction. At 2 K, M - H curves show hysteresis behaviour similar of easy and hard axis of a ferromagnet. The magnetic anisotropy of Co nano clusters are coupled by the magneto crystalline anisotropy of secondary phases of cobalt with TiO2, thus indicating the highly oriented nature of the Co clusters. Role of dipole interactions and inter cluster exchange interactions have also been discussed. © 2018 Elsevier B.V.
Citation: Journal of Magnetism and Magnetic Materials (2018), 465(): 122-127
URI: https://doi.org/10.1016/j.jmmm.2018.05.070
http://repository.iitr.ac.in/handle/123456789/13498
Issue Date: 2018
Publisher: Elsevier B.V.
Keywords: Ion Implantation
SQUID
Superparamagnetism
ISSN: 3048853
Author Scopus IDs: 55534319600
8238440100
35975569700
23482746500
24758795000
26642946700
56238674600
Author Affiliations: Joshi, S.R., Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India, Homi Bhabha National Institute, Training School Comples, Anushakti Nagar, Mumbai, 400085, India, School of Mechanical, Aerospace and Nuclear Engineering, UNIST, Ulsan, 44919, South Korea
Padmanabhan, B., Department of Physics, Indian Institute of Technology, Roorkee, 247667, India
Chanda, A., Department of Physics, Dr. Hari Singh Gour UniversityM.P 470003, India
Shukla, N., UGC-DAE CSR Kalpakkam Node, Kokilamedu, TN 603104, India
Malik, V.K., Department of Physics, Indian Institute of Technology, Roorkee, 247667, India
Kanjilal, D., Inter University Accelerator Center, New Delhi, 110067, India
Varma, S., Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India, Homi Bhabha National Institute, Training School Comples, Anushakti Nagar, Mumbai, 400085, India
Corresponding Author: Varma, S.; Institute of PhysicsIndia; email: shikha@iopb.res.in
Appears in Collections:Journal Publications [PH]

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