Impact of Particle Size on Room Temperature Ferrimagnetism of SrFe12O19
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Impact of Particle Size on Room Temperature Ferrimagnetism of SrFe12O19
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| Creator |
Kumar, Neeraj
Kumar, Anuj Jha, R. Dogra , Anjana Pasricha, Renu Kotnala, R. K. Kishan, Hari Awana, V. P. S. |
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| Subject |
Physics
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| Description |
In this paper, we report the control of important
hysteresis parameters, which are useful for memory devices,
viz. Ms , Hc and Mr/Ms , by changing the particle size/calcination temperature. An investigation of SrFe12O19
nanopowder from the structural and magnetic aspect is
performed using X-ray diffraction (XRD), High Resolution
Transmission Electron Microscopy (HRTEM), Scanning
Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM). The average particle size (APS) of
SrFe12O19(nanopowder) increases from 26 to 600 nm with
calcination temperatures of 400 and 1100 °C in air, respectively. With the increase in calcination temperature, saturation magnetization (Ms ) increases with the decrease in coercivity for the respective sample. The change in saturation magnetization and coercive field are explained on the basis of transition from single domain structure to multi-domain geometry with an increase in the heating temperature. The sample heated at 1000 °C shows a minimum coercive field (2.71 kOe) and an appropriate squareness ratio (Mr/Ms )compared to other calcined samples.
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| Publisher |
Springer Verlag
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| Date |
2010-02-16
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/191/1/159.pdf
Kumar, Neeraj and Kumar, Anuj and Jha, R. and Dogra , Anjana and Pasricha, Renu and Kotnala, R. K. and Kishan, Hari and Awana, V. P. S. (2010) Impact of Particle Size on Room Temperature Ferrimagnetism of SrFe12O19. Journal of Superconductivity and Novel Magnetism, 23 (4). pp. 423-427. ISSN 1557-1947 |
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| Relation |
http://www.springerlink.com/content/86jtw303n3u63552/
http://npl.csircentral.net/191/ |
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