Darminto is a professor of condensed matter physics at the Department of Physics, Institute of Technology Sepuluh Nopember (ITS), Surabaya, Indonesia, with research interests on superconductivity, magneto-electronics, 2D- and nano-materials. Research visits have been conducted on single crystal growing of oxide materials, University of Amsterdam, 1998; on high-Tc Bi-based superconductivity, The University of Tokyo, Japan, 1998–1999; superconducting interfaces and devices, MESA+ Research Institute for Nanotechnology, University of Twente, The Netherlands, 2002–2003; and collaborations on muon based science with RIKEN Nishina Center, Japan, 2007–present; superconducting and magnetic materials with Chiba University, Japan, 2009–2012; materials processing and corrosion with Federal Institute for Material Research and Testing (BAM) Berlin, Germany, 2013–present; neutron scattering and diffraction experiments with National Nuclear Energy Agency, Indonesia, 2005–; synchrotron X-ray experiments with Synchrotron Light Reserach Institute (SRLI) on oxides and carbon based materials, Thailand, 2015–present.
Abstract
Nano-sized materials are generally characterized by specific features being different from the bulk forms. One of them is weak ferromagnetism or superparamagnetism. This may probably be occurred due to specific surface effects which contribute to the properties of the nanomaterials. Most oxide nanoparticles behave as ferromagnetic materials at room temperature.
This phenomenon is an unusual property for non-magnetic oxides. The non-magnetic compounds commonly exhibit paramagneti cordiamagnetic behavior, but not ferromagnetic one. According to several studies, this magnetism may generally originate from magnetic moments of oxygen vacancies (crystalline point defects) at the surface of the nanoparticles, substitutional defects or dangling bonds. This work is to elucidate the magnetism due to defects in oxide nanomaterials, namely, nano-semiconducting oxides, reduced graphene oxides and nanosized superconductors for both p- dan n-type cuprate systems.
Applied Physics and Mathematics
Atomic, Molecular, and Optical Physics
Astrophysics
Condensed Matter Physics
Nuclear and Particle Physics
Quantum Physics
Thermodynamics and Statistical Physics
Nano Physics and Nano Technology
Algebra
Analysis
Geometry
Statistics and Applied Probability
Computational Mathematics and Scientific Computing