MAGNETIC AND ELECTRICAL TRANSPORT PROPERTIES OF MATERIALS WITH MAGNETIC CLUSTER.

• Grant number: 08/11293-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: May 01, 2009
• End date: May 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Varlei Rodrigues
• Grantee: Artur Domingues Tavares de Sá
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The study of nano-systems has acquired great importance in the scientific community and a case of particular importance are clusters, nanoparticles with 2 - 10^7 atoms, with various shapes and composition. Due to their reduced size, their properties are strongly defined by quantum and surface effects, leading to new and unexpected properties. Clusters are usually studied embedded in a matrix, changing the properties of the latter. This procedure is equivalent to functionalize the matrix using the aggregates. In particular, there is a strong interest in semiconductors, metals or insulators doped with magnetic materials due to the interesting properties that these systems offer. As for example we can cite the possibility to control the magnetization of semiconductors using electric fields, affecting the density of charge carriers; also the magneto-resistance effect in a metal matrix or tunneling with spin polarization in dielectric matrices. However, all these studies present a difficulty in common, the control of size and composition of clusters in the samples. We are concluding the construction of an instrument that will allow us to produce mass selected clusters. This equipment, the first one of the kind in Brazil, will enable the production of model samples, i.e., clusters-assembled materials containing nanoparticles with well-defined size and composition. The objective of this project is the study of the model samples using techniques sensitive to the structure, magnetization and electric transport, allowing the understanding of effects seen as a function of the concentration, size and composition of the doping materials. Also, we would find new materials or improve the properties of the know ones with potential for practical applications.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DOMINGUES, ARTUR; DE SA, TAVARES; TOSHIYUKI, VITOR; OIKO, ABRAO; DI DOMENICANTONIO, GIULIA; RODRIGUES, VARLEI. New experimental setup for metallic clusters production based on hollow cylindrical magnetron sputtering. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, v. 32, n. 6, NOV 2014. (08/11588-0, 07/01722-9, 08/11293-0)

DOMINGUES, ARTUR; DE SA, TAVARES; TOSHIYUKI, VITOR; OIKO, ABRAO; DI DOMENICANTONIO, GIULIA; RODRIGUES, VARLEI. New experimental setup for metallic clusters production based on hollow cylindrical magnetron sputtering. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, v. 32, n. 6, p. 8-pg., 2014-11-01. (08/11293-0, 08/11588-0, 07/01722-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SÁ, Artur Domingues Tavares de. Metallic clusters: production and magnetic properties. 2013. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin Campinas, SP.