Magnetism of gold nanorods probed using electron spin resonance

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4961369· OSTI ID:22590550

Kawae, T. ^[1]; Yonemura, H.; Yamada, S. ^[2]; Sakai, N.; Makihara, Y. ^[3]

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1. Department of Applied Quantum Physics, Kyushu University, Fukuoka 819-0395 (Japan)
2. Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395 (Japan)
3. Department of Material Physics and Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395 (Japan)

Electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammonium bromide. ESR signals were detected in AuNRs except the largest one. Two smallest AuNRs showed an abrupt change in the temperature dependence of resonance field and line width at around 60 K, indicating ferromagnetic phase transition. In medium-size AuNRs, the resonance with a large shift was observed below 100 K. The resonance field shifts at the lowest temperature exhibit systematic variation with the system size, which is explained by considering magnetic anisotropy for the ferromagnetic resonance.

• OSTI ID: 22590550
• Journal Information: Applied Physics Letters, Vol. 109, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
ELECTRON SPIN RESONANCE
FERROMAGNETIC RESONANCE
GOLD
LINE WIDTHS
MAGNETISM
NANOSTRUCTURES
PHASE TRANSFORMATIONS
PROBES
SIGNALS
SPECTROSCOPY
TEMPERATURE DEPENDENCE