A5036741002- Magnetic properties of thin films
- Theoretical and Computational Physics
- Multiferroics and related materials
- Metallic Glasses and Amorphous Alloys
- Magneto-Optical Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Magnetic Properties and Synthesis of Ferrites
- Advanced Condensed Matter Physics
- Advanced Memory and Neural Computing
- Iron oxide chemistry and applications
- Rare-earth and actinide compounds
- Material Dynamics and Properties
- Magnetic Properties and Applications
- Phase-change materials and chalcogenides
- Magnetic Field Sensors Techniques
- Quasicrystal Structures and Properties
- Optical Polarization and Ellipsometry
- Shape Memory Alloy Transformations
- Semiconductor materials and devices
- Photonic Crystals and Applications
- Ferroelectric and Piezoelectric Materials
- Quantum and electron transport phenomena
- Heusler alloys: electronic and magnetic properties
Universidade Estadual de Campinas (UNICAMP)
2023-2025
Universidade Federal de Pernambuco
2014-2024
A spin current is usually detected by converting it into a charge through the inverse Hall effect (ISHE) in thin layers of nonmagnetic metal with large spin-orbit coupling, such as Pt, Pd, and Ta. Here we demonstrate that ${\mathrm{Ir}}_{20}$${\mathrm{Mn}}_{80}$, high-temperature antiferromagnetic commonly employed spin-valve devices, exhibits effect, recently predicted theoretically. We present results experiments which currents are generated either microwave pumping or Seebeck bilayers...
NiO is a room-temperature antiferromagnetic (AF) insulator with important applications in AF spintronics. Although it considered prototypical material simple magnetic structure two sublattice spins aligned easy planes and having small in-plane anisotropy, its critical behavior has not been studied detail. Here we present an experimental investigation of the field for transition from to spin-flop (SF) phase obtained magnetization susceptibility measurements. The measured temperature...
Size-controlled Fe 3 O 4 clusters show enhanced dipolar interactions, impacting magnetic properties. A model reveals fields, energy barriers, and relaxation dynamics, supporting biomedical other advanced applications.
In the spin Seebeck effect (SSE), currents generated by thermal gradients applied to a magnetic film are detected an electric voltage along adjacent metallic layer due charge current conversion through inverse Hall effect. The SSE has been widely studied in bilayers made of insulating ferro- or ferrimagnet insulators and metals with large spin-orbit coupling such as platinum. Few studies have reported antiferromagnetic despite increasing attention these materials receiving field spintronics....
The spin Seebeck effect (SSE) consists of the generation a current in magnetic material under thermal gradient, detected by electric it produces an attached metallic layer. Here, authors report studies SSE RbMnF${}_{3}$, nearly isotropic, insulating antiferromagnet with N\'eel temperature 83 K. By varying applied field, they observe antisymmetric step variation typical SSE, both ordered and paramagnetic phases, even at room temperature.
We report the observation of giant Zeeman shifts in optical transitions high-quality very thin films yttrium iron garnet (YIG) grown by rf sputtering on gadolinium gallium substrates. The absorption profile measured with magneto-optical spectroscopy shows dual transition UV-visible frequency region attributed to from O-2p valence band Fe-3d conduction and Fe-2p53d6 excitonic states at Γ-symmetry point YIG structure. application a static magnetic field only 0.6 kOe produces ∼100 meV structure...
Giant magnetoimpedance (GMI) in the reentrant spin-glass (SG) phase of ferromagnetic Fe90Zr10 is reported. The temperature (T) dependence GMI allows investigation spin dynamics SG MHz frequency regime and thus very short relaxation times τ (∼10−8 s). shows a broad maximum around 150 K diminishes with decreasing T below glass Tg 15 K. magnetic permeability data obtained from show general features observed ac susceptibility measured at lower frequencies (10 ≤ f 104 Hz), yielding values Tf...
Multiferroic ceramics of Bi0.99Y0.01Fe1-xNixO3 with 0.01⩽x⩽0.05 were synthesized by using a modified solid state reaction method. The crystalline structure and the morphology samples investigated X-ray diffraction (XRD) scanning electron microscopy (SEM). addition Y Ni to bismuth ferrite (BiFeO3) was found decrease average grain size. Ac magnetic susceptibility zero-field-cooled (ZFC) field-cooled (FC) magnetizations measured for temperatures in range 5⩽T⩽300 K. Hysteresis loops an...
Low temperature magnetization (M) and ac susceptibility (χac) data were used to investigate the reentrant spin-glass state in lengths of melt-spun ribbons Fe100−xZrx (x = 9, 10) amorphous alloys. The range investigated was from 2 300 K, while applied magnetic field H varied ±85 kOe. properties found be strongly influenced by sample composition despite fact that amount Fe varies 1 at. %. For instance, Curie (TC) is reduced 232.5 K 213.0 with decreasing concentration, M for lower measured at...
Here we demonstrate that a ferromagnetic shape memory can be tuned conveniently by volume proportions within Heusler-type Fe47-xMn24+xGa29 (x = 8, 6, 4, 2, and 0 at%) alloys over an extended temperature range. Preliminary X-ray diffraction experiments indicate the crystallize into B2 cubic structure with space group Pm3¯m for all compositions. Samples compositions of x 0–4 at% show co-existence two structures (B2 L21). The dependence magnetization M(T) measurements on under cooling-heating...
Giant magnetoresistance (GMR) in bulk nonmagnetic compounds has received considerable attention since this phenomenon challenged the classical understanding of electron transport under a magnetic field. Here, we report magnetotransport properties diamagnetic intermetallic compound ${\mathrm{YCd}}_{6}$ for applied fields up to 35 T and temperatures down 0.4 K that reveal GMR. We argue large MR value can be explained terms field-induced pseudogaps on Fermi surface. These results are relevant...
We report on processes of generation spin current and conversion into charge in $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$/Pt bilayers by means Hall magnetoresistance (SMR) Seebeck effect (SSE) experiments. Specifically, we explore (001) full-textured $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ (CFO) thin films grown onto (001)-oriented $\mathrm{SrTi}{\mathrm{O}}_{3}$ substrates, covered with Pt layers deposited under two different conditions: one at room temperature another high...
In this paper, we present the proof-of-concept of a device for rectifying ac-magnetic-field effects by mixing thermal spin and charge currents. The consists NiO/Pt bilayer in which pure current is generated perpendicularly to sample plane means Seebeck effect. current, created NiO layer, injected into Pt layer converted inverse Hall effect, measured electrical contacts. Due combination two effects, planar Nernst overall response as function magnetic field similar one diode. resulting mainly...