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Effect of off-stoichiometry in Heusler alloy thin films on spin-dependent tunneling characteristics of X2YZ/MgO magnetic tunnel junction: X-ray absorption spectroscopy and x-ray magnetic circular dichroism

Grant number: 11/22261-5
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): April 01, 2012
Effective date (End): March 23, 2014
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Abner de Siervo
Grantee:Fernando Assis Garcia
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


The main goal of this project is to develop a basic understanding of the microscopic magnetic properties and the related physical mechanisms at interface structure of half-metallic Heusler alloys of X2YZ/MgO. Ultrathin films (up to a few monolayer's) of X2YZ and thick films(several monolayer) will be deposited by Sputering and alternatively with MBE on MgO (001) substrate under ultra-high-vacuum (UHV) conditions. In order to establish an understanding of the magnetic properties of this material at an interface, the electronic and magnetic structure of the films will be studied by different techniques. To determine the electronic structure at the interface of the barrier, we will apply photon absorption and photoelectron spectroscopy using synchrotron radiation. For the magnetic characterization we shall use the in-situ XMCD technique combined with ex-situ MOKE measurements. For this purpose, a new facility, involving an UHV chamber specially designed to perform in-situ XMCD measurements with variable magnetic field up to ± 2T was constructed and will be used during this project.

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)
GARCIA, F. A.; KANEKO, U. F.; GRANADO, E.; SICHELSCHMIDT, J.; HOELZEL, M.; DUQUE, J. G. S.; NUNES, C. A. J.; AMARAL, R. P.; MARQUES-FERREIRA, P.; LORA-SERRANO, R. Magnetic dimers and trimers in the disordered S=3/2 spin system BaTi1/2Mn1/2O3. Physical Review B, v. 91, n. 22 JUN 11 2015. Web of Science Citations: 5.

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