Magnetic study of Fe-doped CdSe nanomaterials
10 May 2016-Vol. 1728, Iss: 1, pp 020105
TL;DR: In this article, the average particle size of pure and doped cadmium selenide (CdSe) was found to be ∼50 nm from scanning electron microscopy (SEM).
Abstract: Nanoparticles of pure and iron (50 %) doped cadmium selenide (CdSe) have been synthesized by soft chemical route. EDAX analysis supports the inclusion of Fe into CdSe nanoparticles. The average particle size of pure and doped CdSe is found to be ∼50 nm from scanning electron microscopy (SEM). Magnetization of the samples are measured under the field cooled (FC) and zero field cooled (ZFC) modes in the temperature range from 5K to 300K applying a magnetic field of 500Oe. Field dependent magnetization (M-H) measurement indicates presence of room temperature (RT) paramagnetism and low temperature (5K) ferromagnetism of the sample.
References
More filters
TL;DR: The first observations of ferromagnetism above room temperature for dilute (<4 at%) Mn-doped ZnO semiconductors are reported, promising new spintronic devices as well as magneto-optic components.
Abstract: The search for ferromagnetism above room temperature in dilute magnetic semiconductors has been intense in recent years. We report the first observations of ferromagnetism above room temperature for dilute ( 700 °C) methods were used, samples were found to exhibit clustering and were not ferromagnetic at room temperature. This capability to fabricate ferromagnetic Mn-doped ZnO semiconductors promises new spintronic devices as well as magneto-optic components.
1,652 citations
Book•
01 Jan 2001
TL;DR: In this article, isolated magnetic moments are used to measure the number of magnetic moments in the magnetosphere and the order and magnetic structures of the magnetism in low-dimensional environments.
Abstract: 1. Introduction 2. Isolated magnetic moments 3. Environments 4. Interactions 5. Order and magnetic structures 6. Order and broken symmetry 7. Magnetism in metals 8. Competing interactions and low dimensionality Appendix A: Units in electromagnetism Appendix B: Electromagnetism Appendix C: Quantum and atomic physics Appendix D: Energy in magnetism and demagnetism Appendix E: Statistical mechanics Appendix F: List of symbols Index
1,161 citations
TL;DR: Shashi B. Singh, Mukta V. Limaye, Sadgopal K. Date, Shubha Gokhale,2,1 and Sulabha K. Kulkarni as discussed by the authors
Abstract: Shashi B. Singh,1 Mukta V. Limaye,1 Sadgopal K. Date,1 Shubha Gokhale,2,1 and Sulabha K. Kulkarni3,* 1DST Unit on Nanoscience, Department of Physics, University of Pune, Pune 411007, India 2School of Sciences, Indira Gandhi National Open University, New Delhi 110068, India 3DST Unit on Nanoscience, Indian Institute of Science Education and Research, Pune 411021, India Received 19 May 2009; published 15 December 2009
57 citations
TL;DR: In this paper, the morphology, solid solubility and local atomic structure around the doping Co atoms of Co-doped ZnO nanoparticles were investigated by scanning electron microscopy.
40 citations
TL;DR: In this article, the authors reported the synthesis of Zn-ferrite nanoparticles by a soft chemical coprecipitation method, where the estimated d is in the range of 2 to 12 nm.
Abstract: In the present study, we report the synthesis of Zn-ferrite nanoparticles by a soft chemical coprecipitation method. The magnetic properties of Zn ferrite are sensitive to their average crystallite size ( d) which can be varied by altering the synthesis conditions. The d value was controlled by the pH of the solution which is related to the number of moles of OH- ions (x ). The XRD pattern of as synthesized samples showed single phase spinel structure. The estimated d is in the range of 2 to 12 nm. The magnetization studies showed that the sample with d = 2 nm is paramagnetic whereas the samples with d >; 2 nm exhibited superparamagnetic behavior. The magnetization at 10 kG increases from 2.6 to 21.4 emu/g as d increases from 2 to 12 nm. The temperature dependent studies for the sample with d = 12 nm shows symmetric spectra with single resonance peak of Lorentzian shape. As the temperature decreases an additional peak at lower field side of the main signal appears. The g value and the linewidth (ΔHPP) increase with decrease in temperature indicating the increase in antiferromagnetic (AFM) interactions between the ions in tetrahedral and the octahedral sites.
36 citations