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In this report we present systematic magnetic studies of pure iron oxidenanoparticles and gold iron oxide nanocomposite with increasing Au particlesize/content. For the magnetic studies of these samples we have measured: (1)zero field cooled (ZFC) and field cooled (FC) magnetization, (2) acsusceptibility, (3) magnetization vs field at various temperatures, (4)thermoremanant magnetization relaxation (TRM) and zero field cooledmagnetization relaxation (ZFCM) at fixed temperature for various wait times twfor studying the aging effect, (5) magnetization memory effect and (6) exchangebias as a function of cooling field. The detailed magnetic measurement analysisindicates that the pure Fe3O4 nanoparticles sample behaves like asuperparamagnet and on incorporation of gold (Au) nanoparticles thenanocomposite system slowly evolves from superparamagnetic to superspin glassstate. The memory and aging effect enhances with the increase of the Aunanoparticle size/content. The most important observation in this study is theenhancement of magnetization with the incorporation of Au nanoparticles. Theenhancement increases with the increase in the Au content in the nanocomposite.We have explained the cause of this enhancement of magnetization as due tolarge orbital magnetic moment formation at the Au/magnetic particle interface.

Enhanced magnetism, memory and aging in Gold-Iron oxide nanoparticle composites