Chapter 9. Conduction electron spin resonance in metallic systems

Edmonds, R. N.; Harrison, Mark; Edwards, Peter P.

doi:10.1039/pc9858200265

Cited by 31 publications

(43 citation statements)

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“…Beginning with the extracted spin lifetimes, we find that the T 2 value for both the C6 and C6/Br AuNPs is 1.02±0.01 ns. As the CESR spectra were acquired below the Debye temperature (170 K), spin relaxation occurs primarily via collisions with lattice defects and, for small particles, the dominant lattice defect is the surface of the particle 8a. Thus, the identical values of spin lifetimes between the two systems are likely because of their near identical diameters.…”

Section: Diameter Cesr Data and Spr Of C6 And C6/br Aunpsmentioning

confidence: 99%

Ligand Control over the Electronic Properties within the Metallic Core of Gold Nanoparticles

2015

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The behavior of electrons within the metallic core of gold nanoparticles (AuNPs) can be controlled by the nature of the surface chemistry of the AuNPs. Specifically, the conduction electron spin resonance (CESR) spectra of AuNPs of diameter 1.8-1.9 nm are sensitive to ligand exchange of hexanethiol for 4-bromothiophenol on the surface of the nanoparticle. Chemisorption of the aromatic ligand leads to a shift in the metallic electron's g-factor toward the value expected for pure gold systems, suggesting an increase in metallic character for the electrons within the gold core. Analysis by UV/Vis absorption spectroscopy reveals a concomitant bathochromic shift of the surface plasmon resonance band of the AuNP, indicating that other electronic properties of AuNPs are also affected by the ligand exchange. In total, our results demonstrate that the chemical nature of the ligand controls the valence band structure of AuNPs.

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Section: Diameter Cesr Data and Spr Of C6 And C6/br Aunpsmentioning

confidence: 99%

Ligand Control over the Electronic Properties within the Metallic Core of Gold Nanoparticles

2015

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“…This allowed to study the temperature dependent spin relaxation of conduction electrons via the line width and gave the first insights into the time scales of spin relaxation. [95][96][97] It motivated the theoretical work. Later, the Kambersk y model 98 was developed for energy relaxation of the ferromagnetic resonance (FMR).…”

Section: Theoretical Perspectivesmentioning

confidence: 99%

Perspective: Ultrafast magnetism and THz spintronics

Walowski

Münzenberg

2016

Journal of Applied Physics

327

205

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This year the discovery of femtosecond demagnetization by laser pulses is 20 years old. For the first time, this milestone work by Bigot and coworkers gave insight directly into the time scales of microscopic interactions that connect the spin and electron system. While intense discussions in the field were fueled by the complexity of the processes in the past, it now became evident that it is a puzzle of many different parts. Rather than providing an overview that has been presented in previous reviews on ultrafast processes in ferromagnets, this perspective will show that with our current depth of knowledge the first applications are developed: THz spintronics and all-optical spin manipulation are becoming more and more feasible. The aim of this perspective is to point out where we can connect the different puzzle pieces of understanding gathered over 20 years to develop novel applications. Based on many observations in a large number of experiments. Differences in the theoretical models arise from the localized and delocalized nature of ferromagnetism. Transport effects are intrinsically non-local in spintronic devices and at interfaces. We review the need for multiscale modeling to address the processes starting from electronic excitation of the spin system on the picometer length scale and sub-femtosecond time scale, to spin wave generation, and towards the modeling of ultrafast phase transitions that altogether determine the response time of the ferromagnetic system. Today, our current understanding gives rise to the first usage of ultrafast spin physics for ultrafast magnetism control: THz spintronic devices. This makes the field of ultrafast spin-dynamics an emerging topic open for many researchers right now. Published by AIP Publishing. [http://dx

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“…Результаты, сильно напоминающие [141,142], были получены и на кла стерах Na в цеолите [265][266][267]: при всех полях, даже при тех, где должна была быть достигнута практически полная ори ентация магнитных моментов атомов Na, подчиняется закону Кюри. Между тем,, металлические кластеры должны были бы вести себя как парамагнетики Паули.…”

Section: 5unclassified

Small metal particles

Nagaev¹

1992

Uspekhi Fizicheskikh Nauk

102

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Chapter 9. Conduction electron spin resonance in metallic systems

Cited by 31 publications

References 0 publications

Ligand Control over the Electronic Properties within the Metallic Core of Gold Nanoparticles

Ligand Control over the Electronic Properties within the Metallic Core of Gold Nanoparticles

Perspective: Ultrafast magnetism and THz spintronics

Small metal particles

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