Giant magnetic moment of nano-sized CuNi clusters
Abstract
We have studied the magnetic properties of the CuNi nanoparticles for three types of sizes prepared by different techniques. By an inductively coupled plasma reactor equipped with the LN2 cooling system, we have produced spherical shaped nanoparticles with various sizes from 10 nm to 100 nm in diameter. Using thermolysis of single molecular precursor in hexadecylamine, we have prepared nanoparticles with an average size of 25 nm. When finer nanoparticles are approached, the magnetic moments are enormously enhanced. The magnetization is almost linear temperature dependent, which could be interpreted by the Langevin-type superparamagnetism. The field dependence of magnetization exhibits ferromagnetic-like behavior with very week hysteresis. The results will be described within a framework of uncompensated spin and/or surface anisotropy.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARU23011J