His primary scientific interests are in Condensed matter physics, Magnetoresistance, Ferromagnetism, Spin valve and Nuclear magnetic resonance. His study in Condensed matter physics is interdisciplinary in nature, drawing from both Annealing, Magnetization, Permalloy and Superferromagnetism. His Magnetoresistance research incorporates elements of Optoelectronics, Quantum tunnelling, Nanotechnology and Analytical chemistry.
His biological study spans a wide range of topics, including Thin film, Oxide and Coercivity. His Spin valve study also includes fields such as
His primary areas of investigation include Condensed matter physics, Magnetoresistance, Optoelectronics, Spin valve and Magnetization. His research in Condensed matter physics tackles topics such as Anisotropy which are related to areas like Magnetic anisotropy. He combines subjects such as Annealing, Quantum tunnelling, Nuclear magnetic resonance and Analytical chemistry with his study of Magnetoresistance.
His Optoelectronics research is multidisciplinary, incorporating perspectives in Noise, Nanotechnology and Voltage. His study in Nanotechnology focuses on Biochip, Biosensor and Magnetic nanoparticles. His Ferromagnetism research is multidisciplinary, incorporating elements of Exchange bias, Coercivity and Superparamagnetism.
Optoelectronics, Condensed matter physics, Magnetoresistance, Nanotechnology and Tunnel magnetoresistance are his primary areas of study. His studies in Optoelectronics integrate themes in fields like Image resolution, Noise and Voltage. His work in the fields of Condensed matter physics, such as Spin-½, overlaps with other areas such as Perpendicular.
His studies deal with areas such as Optics, Electrical engineering, Nuclear magnetic resonance, Biasing and Quantum tunnelling as well as Magnetoresistance. His work in Biochip and Biosensor is related to Nanotechnology. The Tunnel magnetoresistance study combines topics in areas such as Seebeck coefficient, Annealing and Nanopillar.
Paulo P. Freitas spends much of his time researching Optoelectronics, Magnetoresistance, Nanotechnology, Condensed matter physics and Tunnel magnetoresistance. His Optoelectronics study combines topics from a wide range of disciplines, such as Spintronics and Voltage, Rectifier. His Magnetoresistance research includes elements of Flexible electronics, Noise, Electrical engineering, Magnetic flux and Biasing.
The Nanotechnology study which covers Biomedical engineering that intersects with Magnetic nanoparticles, Matrix and Visual cortex. His Condensed matter physics research incorporates themes from Spin-transfer torque, Demagnetizing field, Magnetic hysteresis, Magnetic energy and Anisotropy. His Tunnel magnetoresistance research includes themes of Seebeck coefficient, Signal, Quantum tunnelling and Spin-½.
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Magnetoresistive-based biosensors and biochips.
Daniel L. Graham;Hugo A. Ferreira;Paulo P. Freitas.
Trends in Biotechnology (2004)
Thermodynamic fluctuations in the superconductor Y 1 Ba 2 Cu 3 O 9 − δ : Evidence for three-dimensional superconductivity
P. P. Freitas;C. C. Tsuei;T. S. Plaskett.
Physical Review B (1987)
Biodetection using magnetically labeled biomolecules and arrays of spin valve sensors (invited)
H. A. Ferreira;D. L. Graham;P. P. Freitas;J. M. S. Cabral.
Journal of Applied Physics (2003)
Observation of s‐d exchange force between domain walls and electric current in very thin Permalloy films
P. P. Freitas;L. Berger.
Journal of Applied Physics (1985)
Large tunneling magnetoresistance enhancement by thermal anneal
R. C. Sousa;J. J. Sun;V. Soares;P. P. Freitas.
Applied Physics Letters (1998)
Interacting ferromagnetic nanoparticles in discontinuous Co 80 Fe 20 /Al 2 O 3 multilayers: From superspin glass to reentrant superferromagnetism
W. Kleemann;O. Petracic;Ch. Binek;G. N. Kakazei.
Physical Review B (2001)
Single magnetic microsphere placement and detection on-chip using current line designs with integrated spin valve sensors: Biotechnological applications
D. L. Graham;H. Ferreira;J. Bernardo;P. P. Freitas.
Journal of Applied Physics (2002)
Phase coherent precessional magnetization reversal in microscopic spin valve elements.
H. W. Schumacher;C. Chappert;P. Crozat;R. C. Sousa.
Physical Review Letters (2003)
Planar Hall effect sensor for magnetic micro- and nanobead detection
Louise Wellendorph Ejsing;Mikkel Fougt Hansen;Aric Kumaran Menon;H.A. Ferreira.
Applied Physics Letters (2004)
Study of the dynamic magnetic properties of soft CoFeB films
C. Bilzer;T. Devolder;Joo-Von Kim;G. Counil.
Journal of Applied Physics (2006)
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