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E-grāmata: Magnetic Nanoparticles: A Study by Synchrotron Radiation and RF Transverse Susceptibility

  • Formāts: PDF+DRM
  • Sērija : Springer Theses
  • Izdošanas datums: 09-Jul-2014
  • Izdevniecība: Springer International Publishing AG
  • Valoda: eng
  • ISBN-13: 9783319070940
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Magnetic Nanoparticles: A Study by Synchrotron Radiation and RF Transverse SusceptibilityPalielināt
  • Formāts: PDF+DRM
  • Sērija : Springer Theses
  • Izdošanas datums: 09-Jul-2014
  • Izdevniecība: Springer International Publishing AG
  • Valoda: eng
  • ISBN-13: 9783319070940
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Magnetic nanoparticles (NPs) are finding their place in many modern technologies such as electronics (memory or spintronic devices) and medicine (contrast media, electromagnetic thermal therapy) to name just a few examples. The application of modern techniques based on synchrotron radiation, in particular X-ray spectroscopies, as well as an rf transverse susceptibility probe, built ad hoc, allowed the author to investigate several classes of magnetic NPs with diverse applications. For example, the interesting anisotropic properties of CoW and CoPt NPs revealed new magnetic behaviour and phases. Gold NPs prepared on a biological template from Sulfolobus acidocaldarius S-layer, were shown to possess intrinsic magnetism caused by the electron exchange with the sulfur atoms of the template. Silica and oleic acid coated magnetite NPs showed excellent human compatibility while preserving the bulk magnetic figures of merit. Both macroscopic and microscopic properties of all these NPs, hitherto unexplained, have been revealed for the first time.
1 Introduction
1(12)
1.1 Magnetism in Nanoparticles
1(3)
1.2 Characterization of Magnetic Nanoparticles
4(2)
1.3 What We Cover in This Thesis
6(3)
1.4 Outline
9(4)
References
10(3)
2 Experimental Techniques
13(18)
2.1 Transmission Electron Microscopy
13(2)
2.1.1 JEOL JEM 3,000 F
14(1)
2.1.2 FEI Tecnai™ G2 F30 STWIN
15(1)
2.2 SQUID Based Magnetometry
15(2)
2.3 Anomalous Hall Effect
17(1)
2.4 X-ray Absorption Spectroscopies in Synchrotron Radiation Facilities
18(13)
2.4.1 X-ray Absorption Fine Structure
21(4)
2.4.2 X-ray Magnetic Circular Dichroism
25(4)
References
29(2)
3 Structural and Magnetic Properties of Amorphous Co--W Alloyed Nanoparticles
31(36)
3.1 Samples Studied
32(2)
3.2 Morphological and Structural Study
34(15)
3.2.1 Microscopy Measurements
34(5)
3.2.2 XANES and EXAFS Measurements
39(10)
3.3 Magnetic Study
49(10)
3.3.1 SQUID-Based Magnetometry
49(6)
3.3.2 Magnetic Anisotropy of the Co---W Particles
55(1)
3.3.3 X-ray Magnetic Circular Dichroism Magnetometry
56(3)
3.4 Discussion
59(5)
3.5 Conclusions
64(3)
References
64(3)
4 Breakdown of Hund's Third Rule in Amorphous Co---W Alloy Nanoparticles
67(16)
4.1 XANES and XMCD Measurements
68(6)
4.1.1 Co K Edge Results
69(2)
4.1.2 W L2,3 Edges Results
71(3)
4.2 Calculations of DOS, XANES and XMCD
74(4)
4.2.1 DOS Calculations
75(1)
4.2.2 Co K Edge
76(1)
4.2.3 W L2,3 Edges
77(1)
4.3 Discussion
78(2)
4.4 Conclusion
80(3)
References
80(3)
5 Structural and Magnetic Properties of Co---Pt Nanoparticles
83(32)
5.1 Samples Studied
84(1)
5.2 Morphological and Structural Study
84(9)
5.2.1 Microscopy Measurements
84(2)
5.2.2 XANES and EXAFS Measurements
86(7)
5.3 Magnetic Study
93(15)
5.3.1 SQUID-Based Magnetometry
93(6)
5.3.2 Anomalous Hall Effect Magnetometry
99(2)
5.3.3 X-ray Magnetic Circular Dichroism Magnetometry
101(7)
5.4 Discussion
108(3)
5.5 Conclusions
111(4)
References
112(3)
6 d-Band Magnetism of Ag, Au, Pd and Pt Nanostructured Materials
115(12)
6.1 Magnetism in Bulk Metals
115(2)
6.2 Induced Magnetism in Nanoparticle Matrix
117(1)
6.3 Intrinsic Magnetic Moment in M Nanoparticles
118(5)
6.4 Conclusions
123(4)
References
124(3)
7 Transverse Susceptibility Measurement System for the PPMS
127(18)
7.1 Theoretical Model of the Magnetic Transverse Susceptibility
128(2)
7.2 Description of the TS Measurement System
130(2)
7.3 Design and Implementation of the Oscillator Circuit
132(5)
7.4 Data Acquisition
137(1)
7.5 Test Measurements
137(5)
7.5.1 Test Measurements on an Empty Coil
137(2)
7.5.2 Calibration of the TS Measurement System with Gd2O3
139(1)
7.5.3 Test Measurements on a Known and Previously Characterized Sample with a TDO Based TS System
140(2)
7.5.4 Low Temperature Measurements on TmCo2
142(1)
7.6 Conclusions
142(3)
References
143(2)
8 Transverse Susceptibility of Iron Oxide Nanoparticles Systems
145(18)
8.1 Magnetite Nanoparticles
145(9)
8.1.1 Experimental
146(2)
8.1.2 Magnetic Properties
148(2)
8.1.3 Discussion
150(3)
8.1.4 Conclusions
153(1)
8.2 Maghemite Nanoparticles
154(9)
8.2.1 TS Measurements
155(1)
8.2.2 Discussion
156(3)
8.2.3 Conclusions
159(1)
References
160(3)
9 General Conclusions
163
9.1 Perspectives
164
References
165
A. I. Figueroa obtained her B.S. degree in Engineering Physics at the Universidad del Cauca in Popayan, Colombia in 2008. Then she moved to Zaragoza, Spain where she completed her M. Sc. in Physics in 2009 and her Ph.D. in 2012. She is currently a postdoctoral researcher in the Magnetic Spectroscopy Lab of Diamond Light Source, the UK national synchrotron, in Oxfordshire. Her scientific interests are spintronics, magnetic materials and synchrotron radiation techniques applied to magnetism studies.
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