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Title: Comparative study of magnetic ordering in bulk and nanoparticles of Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3}: Magnetization and electron magnetic resonance measurements

Abstract

To explore the effect of size reduction to nanoscale on the hole doped Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3} compound, dc magnetic measurements and electron magnetic resonance (EMR) were done on bulk and nanoparticle samples in the temperature range 10 ≤ T ≤ 300 K. Magnetization measurement showed that the bulk sample undergoes a charge ordering transition at 240 K and shows a mixed magnetic phase at low temperature. However, the nanosample underwent a ferromagnetic transition at 75 K, and the charge ordered state was destabilized on size reduction down to nanoscale. The low-temperature ferromagnetic component is found to be enhanced in nanoparticles as compared to their bulk counterpart. Interestingly around room temperature, bulk particles show higher magnetization where as at low temperature nanoparticles show higher magnetization. Ferromagnetism in the bulk is due to super exchange where as ferromagnetism in nanoparticles is due to uncompensated spins of the surface layer. Temperature variation of EMR parameters correlates well with the results of magnetic measurements. The magnetic behaviour of the nanoparticles is understood in terms of the core shell scenario.

Authors:
 [1];  [2];  [1]; ;  [3]
  1. Department of Physics, Dr. Ambedkar Institute of Technology, Bangalore 560056 (India)
  2. (India)
  3. Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
Publication Date:
OSTI Identifier:
22410127
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; COMPARATIVE EVALUATIONS; DOPED MATERIALS; ELECTRONS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; HOLES; LAYERS; MAGNETIC RESONANCE; MAGNETIZATION; MANGANATES; NANOPARTICLES; NANOSTRUCTURES; SAMARIUM COMPOUNDS; SPIN; SURFACES; TEMPERATURE DEPENDENCE

Citation Formats

Goveas, Lora Rita, E-mail: loragoveas@gmail.com, St. Joseph's College of Arts and Science, Bangalore 560027, Anuradha, K. N., Bhagyashree, K. S., and Bhat, S. V. Comparative study of magnetic ordering in bulk and nanoparticles of Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3}: Magnetization and electron magnetic resonance measurements. United States: N. p., 2015. Web. doi:10.1063/1.4913722.
Goveas, Lora Rita, E-mail: loragoveas@gmail.com, St. Joseph's College of Arts and Science, Bangalore 560027, Anuradha, K. N., Bhagyashree, K. S., & Bhat, S. V. Comparative study of magnetic ordering in bulk and nanoparticles of Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3}: Magnetization and electron magnetic resonance measurements. United States. doi:10.1063/1.4913722.
Goveas, Lora Rita, E-mail: loragoveas@gmail.com, St. Joseph's College of Arts and Science, Bangalore 560027, Anuradha, K. N., Bhagyashree, K. S., and Bhat, S. V. Thu . "Comparative study of magnetic ordering in bulk and nanoparticles of Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3}: Magnetization and electron magnetic resonance measurements". United States. doi:10.1063/1.4913722.
@article{osti_22410127,
title = {Comparative study of magnetic ordering in bulk and nanoparticles of Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3}: Magnetization and electron magnetic resonance measurements},
author = {Goveas, Lora Rita, E-mail: loragoveas@gmail.com and St. Joseph's College of Arts and Science, Bangalore 560027 and Anuradha, K. N. and Bhagyashree, K. S. and Bhat, S. V.},
abstractNote = {To explore the effect of size reduction to nanoscale on the hole doped Sm{sub 0.65}Ca{sub 0.35}MnO{sub 3} compound, dc magnetic measurements and electron magnetic resonance (EMR) were done on bulk and nanoparticle samples in the temperature range 10 ≤ T ≤ 300 K. Magnetization measurement showed that the bulk sample undergoes a charge ordering transition at 240 K and shows a mixed magnetic phase at low temperature. However, the nanosample underwent a ferromagnetic transition at 75 K, and the charge ordered state was destabilized on size reduction down to nanoscale. The low-temperature ferromagnetic component is found to be enhanced in nanoparticles as compared to their bulk counterpart. Interestingly around room temperature, bulk particles show higher magnetization where as at low temperature nanoparticles show higher magnetization. Ferromagnetism in the bulk is due to super exchange where as ferromagnetism in nanoparticles is due to uncompensated spins of the surface layer. Temperature variation of EMR parameters correlates well with the results of magnetic measurements. The magnetic behaviour of the nanoparticles is understood in terms of the core shell scenario.},
doi = {10.1063/1.4913722},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}