Electron Magnetic Resonance Studies on Nanowire and Nanoparticle Arrays

2009 ◽  
Vol 1228 ◽  
Author(s):  
Osei K Amponsah ◽  
Rakhim R. Rakhimov ◽  
Yuri A. Barnakov ◽  
Rosa A Lukaszew ◽  
Jeffrey C Owrutsky ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Magnetic Resonance ◽  
Electron Magnetic Resonance ◽  
Superparamagnetic Nanoparticles ◽  
Magnetic Nanowires ◽  
Nanoparticle Arrays ◽  
Alumina Membrane ◽  
Magnetic Resonance Studies ◽  
Magnetic Inclusions

AbstractArrays of magnetic nanowires and well-oriented chains of superparamagnetic nanoparticles were fabricated using polymer and alumina membrane templates. The systems were characterized by SQUID and studied by electron magnetic resonance methods. Comparative analysis of the obtained results for different geometries and sizes of the magnetic inclusions is presented.

Between Quantum and Classical: Evolution of Electron Magnetic Resonance with Growth of a Spin System Size

2014 ◽  
Vol 1636 ◽  
Author(s):  
Brittany Bates ◽  
James Hilton ◽  
Carl Bonner ◽  
Natalia Noginova
Keyword(s):  
Magnetic Resonance ◽  
System Size ◽  
Electron Magnetic Resonance ◽  
Superparamagnetic Nanoparticles ◽  
Multiple Quantum ◽  
Electron Spins ◽  
Ferromagnetic Domains ◽  
Quantum Transitions ◽  
Quantum Approach ◽  
Quantum Behavior

ABSTRACTSystems with a single or several coupled electron spins are commonly described with the quantum approach while ferromagnetic domains with millions of coupled spins are classical systems. Large spin clusters and superparamagnetic nanoparticles contain hundreds of coupled electron spins, and are on the boundary between classical and quantum behavior. Electron magnetic resonance observed in ultra-fine iron oxide nanoparticles (∼ 5 nm size) reveals several features which are typical for paramagnetic spins and absent in macroscopic systems, including multiple quantum transitions observed at H0/n, where n = 2, 3, 4 and H0 is the field of the main resonance. In order to better understand the transition from quantum to classical behavior and magnetization dynamics at the nanoscale, we study the evolution of the EMR signal with increase of the particle size in suspensions of magnetite nanoparticles. The experimental data are compared with numerical simulations.

Electron magnetic resonance studies of the Pr3Ga5SiO14 and Nd3Ga5SiO14 kagomé systems

2011 ◽  
Vol 109 (7) ◽  
pp. 07E137 ◽  
Author(s):  
Sanhita Ghosh ◽  
Saiti Datta ◽  
Haidong Zhou ◽  
Michael Hoch ◽  
Christopher Wiebe ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Electron Magnetic Resonance ◽  
Magnetic Resonance Studies
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