MDPI Multidisciplinary Digital Publishing Institute;Switzerland: MDPI AG
摘要:
摘要： We report on the results of investigating the ferromagnetic properties of bare Cu nanoparticles. Three sets of bare Cu nanoparticle assemblies with mean particle diameters of 6.6, 8.1, and 11.1 nm were fabricated, employing the gas condensation method. Curie-Weiss paramagnetic responses to a weak driving magnetic field were detected, showing the appearance of particle superspins that overcomes the diamagnetic responses from the inner core. The isothermal magnetization displays a Langevin field profile together with magnetic hysteresis appearing even at 300 K, demonstrating the existence of ferromagnetic superspins in the Cu nanoparticles. Shifting of a noticeable amount of electronic charge from being distributed near the lattice sites in bulk form toward their neighboring ions in nanoparticles was found. The extended 3d and 4s band mixture are the main sources for the development of localized 3d holes for the development of ferromagnetic particle superspins in Cu nanoparticles. 其他題名： Int J Mol Sci 出版者： Switzerland: MDPI AG 出版日期： 2015-09-24 出處： International journal of molecular sciences, 2015-09, Vol.16 (10), p.23165-23176 資源來源： Publicly Available Content Database 版權： Copyright MDPI AG 2015 版權： 2015 by the authors; licensee MDPI, Basel, Switzerland. 2015 識別號： ISSN: 1422-0067 識別號： ISSN: 1661-6596 識別號： EISSN: 1422-0067 識別號： DOI: 10.3390/ijms161023165 識別號： PMID: 26404237
