27 citations · 173 across the 19 of their papers we have counts for
19 papers
Superconducting Spintronic Heat Engine
Clodoaldo I. L. de Araujo, Pauli Virtanen, Maria Spies +7
Heat engines are key devices that convert thermal energy into usable energy. Strong thermoelectricity, at the basis of electrical heat engines, is present in superconducting spin t…
Quantifying ground state degeneracy in planar artificial spin ices: the magnetic structure factor approach
F. S. Nascimento, L. B. de Oliveira, D. G. Duarte +3
Magnetic structure factor (MSF) is employed to investigate the ground state degeneracy in rectangular-like artificial spin ices. Our analysis considers the importance of nanoisland…
Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
Zhuoran Geng, Alberto Hijano, Stefan Ilic +16
We review the use of hybrid thin films composed of superconductors and ferromagnets for creating non-reciprocal electronic components and self-biased detectors of electromagnetic r…
Direct observation of magnetic monopole freedom in two-dimensional artificial spin ice
D. G. Duarte, L. B. de Oliveira, F. S. Nascimento +4
Magnetic monopole unpairing as a function of external magnetic fields is presented as a fingerprint of this emergent quasiparticles freedom in a two-dimensional artificial spin ice…
Memristive effects in nanopatterned permalloy Kagomé array
Wesley B. J. Fonseca, Flavio Garcia, Francesco Caravelli +1
We study memristive effects in Kagomé nanopatterned permalloy. We observe that at low frequencies a thermistor effect is present, a phenomenon arising due to the lithography and ab…
Macroscopic Magnetic Monopoles in a 3D-Printed Mechano-Magnet
Hamilton A. Teixeira, Maria F. Bernardo, Michael D. Saccone +3
The notion of magnetic monopoles has puzzled physicists since the introduction of Maxwell's Equations and famously Dirac had hypothesized them in the context of quantum mechanics.…
Room temperature two terminal tunnel magnetoresistance in lateral graphene transistor
C. I. L. de Araujo, H. A. Teixeira, O. O. Toro +9
We investigate the behavior of both pure spin and spin-polarized currents measured with four probe non-local and two probe local configurations up to room temperature and under ext…
Anisotropic MagnetoMemristance
Francesco Caravelli, Ezio Iacocca, Gia-Wei Chern +2
In the last decade, nanoscale resistive devices with memory have been the subject of intense study because of their possible use in brain-inspired computing. However, operational e…
Experimental and theoretical evidences for the ice regime in planar artificial spin ices
R. P. Loreto, F. S. Nascimento, R. S. Gonçalves +5
In this work, we explore a kind of geometrical effect in the thermodynamics of artificial spin ices (ASI). In general, such artificial materials are athermal. Here, We demonstrate…
Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology
I. R. B. Ribeiro, F. S. Nascimento, S. O. Ferreira +7
In this letter, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rec…
Creation,transport and detection of imprinted magnetic solitons stabilized by spin-polarized current
R. P. Loreto, W. A. Moura-Melo, A. R. Pereira +4
With the recent proposition of skyrmion utilization in racetrack memories at room temperature, skyrmionics has become a very attractive field. However, for the stability of skyrmio…
Hallmarks of the Kardar-Parisi-Zhang universality class elicited by scanning probe microscopy
Sidiney G. Alves, Clodoaldo I. L. de Araujo, Silvio C. Ferreira
Scanning probe microscopy (SPM) is a fundamental technique for the analysis of surfaces. In the present work, the interface statistics of surfaces scanned with a probe tip was anal…
Ferromagnetic resonance and magnetoresistive measurements evidencing magnetic vortex crystal in nickel thin film with patterned antidot array
I. R. B. Ribeiro, J. F. Felix, L. C. Figueiredo +6
Ferromagnetic vortices deliver robust out-of-plane magnetization at extremely small scales. Their handling and creation therefore has high potential to become a necessary ingredien…
Low-field microwave absorption and magnetoresistance in iron nanostructures grown by electrodeposition on n-type lightly-doped silicon substrates
J. F. Felix, L. C. Figueiredo, J. B. S. Mendes +2
In this study we investigate magnetic properties, surface morphology and crystal structure in iron nanoclusters electrodeposited on lightly-doped (100) n-type silicon substrates. O…
Order and thermalized dynamics in Heisenberg-like square and Kagomé spin ices
G. M. Wysin, A. R. Pereira, W. A. Moura-Melo +1
Thermodynamic properties of a spin ice model on a Kagomé lattice are obtained from dynamic simulations and compared with properties in square lattice spin ice. The model assumes th…
Circular single domains in hemispherical small size Permalloy clusters
Clodoaldo I. L. de Araujo, Jakson M. Fonseca, João P. Sinnecker +3
We have studied ferromagnetic Permalloy clusters obtained by electrodeposition on n-type silicon. Magnetization measurements reveal hysteresis loops almost independent on temperatu…
Realization of magnetic monopoles current in an artificial spin ice device: A step towards magnetronics
R. P. Loreto, L. A. Morais, R. C. Silva +5
Magnetricity- the magnetic equivalent of electricity- was recently verified experimentally for the first time. Indeed, just as the stream of electric charges produces electric curr…
Vortex-crystal pattern in an anti-artificial spin ice system
C. I. L. de Araujo, R. C. Silva, I. R. B. Ribeiro +6
We have proposed in this work an original system composed by anti-dots nanopatterned in a ferromagnetic thin film, mimicking negatively the structure of an articial spin ice. In th…
Spin Transfer from a Ferromagnet into a Semiconductor through an Oxide barrier
C. I. L. de Araujo, M. A. Tumelero, A. D. C. Viegas +2
We present results on the magnetoresistance of the system Ni/Al203/n-doped Si/Al2O3/Ni in fabricated nanostructures. The results at temperature of 14K reveal a 75% magnetoresistanc…