The modulation of coupling in the relaxation behavior of light transmitted through binary ferrofluids

✍ Scribed by Jian Li; Yueqiang Lin; Xiaodong Liu; Bangcai Wen; Tingzhen Zhang; Qingmei Zhang; Hua Miao

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 529 KB
• Volume: 283
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2009.11.016

✦ Synopsis

With an external magnetic field, a relaxation process is observed when the light transmit through binary ferrofluids composed of ferrimagnetic CoFe 2 O 4 and paramagnetic p-NiFe 2 O 4 nanoparticles similar to ferrofluids consisting only of CoFe 2 O 4 . Since only the ferrimagnetic nanoparticles are able to form fieldinduced chainlike structures for such binary ferrofluids by magnetic interaction between the particles, so the relaxation behavior of the transmitted light is caused mainly by the ferrimagnetic system. In the binary ferrofluids, the paramagnetic nanoparticles, regarded as magnetically polarized gas molecules, are restrained to occupy the space between the ferrimagnetic chains and distribute following the CoFe 2 O 4 particle chains covering and diverging, producing a modulation effect on the relaxation behavior of the transmitted light. The modulation effect can be characterized by range and time parameters that describe the relationship of the relaxation behavior of the transmitted light to the properties of the binary ferrofluids and single CoFe 2 O 4 ferrofluids.