Swift heavy ion irradiation induced modifications in magnetic and dielectric properties of Mn–Ca ferrite

► Effects of 200MeV Ag15+ ion irradiation of nanocrystalline Mn–Ca ferrite investigated using utmost techniques. ► Characterization results confirmed formation of cubic spinel structure and spherical morphology consistent with the crystalline diameter. ► After irradiation, the saturation magnetizati...

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Bibliographic Details
Published in:	Applied surface science Vol. 258; no. 9; pp. 4207 - 4211
Main Authors:	Dolia, S.N., Sharma, P.K., Dhawan, M.S., Kumar, Sudhish, Prasad, Arun S., Samariya, A., Pareek, S.P., Singhal, R.K., Asokan, K., Xing, Y.T., Alzamora, M., Saitovitach, E.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 15-02-2012 Elsevier
Subjects:	Clusters, nanoparticles, and nanocrystalline materials Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Dielectric constant Dielectric properties Electric fields Exact sciences and technology Ferrite Fine-particle systems Ion irradiation Irradiation Magnetic properties Magnetic properties and materials Manganese Nanocrystalline ferrite Nanocrystalline materials Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Physics Radiation effects on specific materials SHI irradiation Small particles and nanoscale materials Structure of solids and liquids; crystallography Studies of specific magnetic materials Superparamagnetism SHI irradiation Nanocrystalline ferrite Superparamagnetism Dielectric properties Crystal growth Grain boundaries Frequency dependence Heavy ions Physical radiation effects Surface treatments XRD Ion beams Ferrites Nanoparticles Transmission electron microscopy Spinels Electric field effects Coercive force Permittivity Nanocrystal Saturation magnetization
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Summary:	► Effects of 200MeV Ag15+ ion irradiation of nanocrystalline Mn–Ca ferrite investigated using utmost techniques. ► Characterization results confirmed formation of cubic spinel structure and spherical morphology consistent with the crystalline diameter. ► After irradiation, the saturation magnetization, coercivity, and blocking temperature enhance appreciably. ► SHI irradiation induced modifications in surface states of the nanoparticles and cationic re-distribution identified as probable reasons. ► Irradiation caused increase in dielectric constant, attributed to surface modifications through slight crystal growth. The effects of 200MeV Ag15+ ion irradiation on structural, magnetic and dielectric properties of nanocrystalline Mn–Ca ferrite have been investigated. The specimens characterized using XRD confirmed the formation of cubic spinel structure. The TEM images revealed the spherical morphology consistent with the crystalline diameter. After irradiation by 200MeV Ag ions, saturation magnetization, coercivity, and blocking temperature were enhanced appreciably which could be attributed to swift heavy ion (SHI) irradiation induced modifications in surface states of the nanoparticles, slight increase in crystallite size and cationic re-distribution. The dielectric measurements revealed that both dielectric constant (ɛr) and the loss tangent (tanδ) disperse normally as a function of frequency of the externally applied electric field. The increase in ɛr and tanδ on irradiation could be attributed to the surface modifications through slight crystal growth and hence the availability of sufficient number of Fe2+/Mn3+ ions particularly at the octahedral site on grain boundaries showing a fair agreement with the magnetization results.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2011.06.011