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Applied Magnetism Institute

IMA

MPMS - SQUIDsquid

It is a SQUID magnetometer with an EverCool system that enables continuous operation. The measured temperature range is from 1.9 to 400 K. The superconducting magnetic system provides +/- 5T reversible operation. The equipment also has a RSO system, with a sensitivity of 5x10-9 emu, and AC option, which measures in a frequency range of 0.001-1000 Hz. The combination of the high sensitivity SQUID system and the suppression of intrinsically high noise, offers a potential for maximum sensitivity in characterizing magnetic properties for very low magnetization systems, such as magnetism in Au or ZnO nanoparticles, or systems requiring low excitation fields such as spin glass or high temperature superconductors.

 

VSMvsm

Quantum Design's Physical Property Measurement System (PPMS®) equipped with Vibrant Sample Magnetometer (VSM). It allows making magnetic measurements between 4 and 1000 K with superconducting coil of 9 Tesla.

 

Magneto-Optical Laboratorymagopt

The magneto-optical laboratory allows Kerr and Faraday measurements to determine the longitudinal, polar and transverse components of the magnetization. It has 4 lasers of different wavelengths in addition to a white lamp with monochromator for spectroscopy. To improve the signal-to-noise ratio, it has mechanical and photoacoustic modulation systems and amplifiers lock-in for signal analysis. The system allows to measure in reflection, transmission and diffraction mode. The coils and electromagnets allow the application of magnetic fields up to 0.8 T. All systems are controlled by computer using programs developed in the IMA.

 

Electron Evaporation Film Deposition Systemevapelec

The system is mounted a self-designed hood that allows a pressure of 10-8 torr. It consists of an evaporator of 4 independent heads that can operate simultaneously so that layers of alloy or multilayer can be deposited without breaking the vacuum.

 

Magnetoresistance characterizationmagres

It is a self-designed equipment that combines ARS cryostat (model CS202 * I-DMX-1SS) with a GMW Associates model 3470 electromagnet. The system allows temperatures up to 5 K in the sample chamber, and measurements can be taken with up to 8 connectors. The electromagnet allows applying magnetic fields of up to 4 kOe in the area of the sample. The system also has quartz windows that allow optical measurements of reflection, luminescence, transmission, and magneto-optics in combination with electrical measurements.

 

Magnetic hyperthermiahipertermia

Calorimetric characterization of magnetic colloids with 10 standar frequencies that allows a range from 100 to 1000 kHz, and amplitude up to 20 kA/m. Optical sensor and probes enable temperature increase. A thermal bath maintains the coils at constant temperature. A second refrigeration system allows the control of ambient temperature, from 5 to 50 ºC.

 

Laboratory of sensors and devicessensores

In this laboratory there is instrumentation for thermal treatment under magnetic field and the characterization of soft magnetic materials. For this, different designs of Helmholtz coils, solenoids, etc as well as instrumentations are available (current sources, function generators, lock-in amplifiers, oscilloscopes, etc.). As a distinctive element, two special assemblies can be highlighted: a device to analyze the magnetoelastic resonance of magnetic tapes and microfilaments in the KHz range and the microwave system for the study of the GHz responses of these materials. This instrumentation has allowed the development of wireless pressure sensors, useful in biomedical applications.

 

Microwave Laboratorymicromat

Equipped with an anechoic chamber, Agilent vector analyzer, waveguides and antenna sets, it allows measurements in reflection and transmission, in waveguide and in open space. Of particular note is the reflectivity measurement on metal plates covered with magnetic composites.

 

Laboratory of synthesis of magnetic materialssintesis

The Institute of Magnetism has a well-equipped laboratory for the synthesis of magnetic materials from different synthesis routes: chemical synthesis, ultrafast cooling, mechanical alloying, evaporation chamber, etc.