期刊
ACTA PHYSICA POLONICA A
卷 121, 期 5-6, 页码 1321-1323出版社
POLISH ACAD SCIENCES INST PHYSICS
DOI: 10.12693/APhysPolA.121.1321
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We have investigated the magnetic behavior of magnetite nanoparticles covered by the 11-mercaptoundecanoic acid around magnetite core prepared by a standard co-precipitation method. The particles show superparamagnetic behavior at room temperature, with transition to a blocked state at blocking temperature 91 K estimated from zero field cooled and field cooled at 500 Oe experiment. The hysteresis loop measured at 293 K showed magnetization 32.8 emu/g at 50 kOe without any coercivity. The mean particle size (7.1 nm) was determined by fitting a magnetization curve obtained at 295 K assuming a log normal size distribution.
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