A5086592036- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Graphene research and applications
- Ferroelectric and Negative Capacitance Devices
- Semiconductor materials and devices
- nanoparticles nucleation surface interactions
- Theoretical and Computational Physics
- 2D Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Additive Manufacturing Materials and Processes
- Advancements in Battery Materials
- Magnetic Properties of Alloys
- Electronic and Structural Properties of Oxides
- Quantum Computing Algorithms and Architecture
- Chemical and Physical Properties of Materials
- Magnetic and transport properties of perovskites and related materials
- Metallurgical and Alloy Processes
- Magnetic Field Sensors Techniques
- Topological Materials and Phenomena
- ZnO doping and properties
- Multiferroics and related materials
- Transition Metal Oxide Nanomaterials
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
IMDEA Nanoscience
2017-2025
Universidad Autónoma de Madrid
2017-2024
Madrid Institute for Advanced Studies
2017-2023
A major challenge for future spintronics is to develop suitable spin transport channels with long lifetime and propagation length. Graphene can meet these requirements, even at room temperature. On the other side, taking advantage of fast motion chiral textures, that is, Néel-type domain walls magnetic skyrmions, satisfy demands high-density data storage, low power consumption, high processing speed. We have engineered epitaxial structures where an ferromagnetic Co layer sandwiched between...
The ever-increasing demand for efficient data storage and processing has fueled the search novel memory devices. By exploiting spin-to-charge conversion phenomena, spintronics promises faster low power solutions alternative to conventional electronics. In this work, a remarkable 34-fold increase in current is demonstrated when incorporating 2D epitaxial graphene monolayer between iron platinum layers by exploring spin-pumping on-chip Furthermore, it found that spin also anisotropic. This...
We have studied a series of Pt/Co/M epitaxial trilayers, in which Co is sandwiched between Pt and non magnetic layer M (Pt, Ir, Cu, Al). Using polar magneto-optical Kerr microscopy, we show that the field- induced domain wall speeds are strongly dependent on nature top layer, they increase going from M=Pt to lighter metallic overlayers, can reach several 100 m/s for Pt/Co/Al. The DW dynamics consistent with presence chiral N\'eel walls stabilized by interfacial Dzyaloshinskii-Moriya...
Nanometer-thick epitaxial Co films intercalated between graphene (Gr) and a heavy metal (HM) substrate are promising systems for the development of spin–orbitronic devices due to their large perpendicular magnetic anisotropy (PMA). A combination theoretical modeling experiments reveals origin PMA explains its behavior as function thickness. High quality Gr/Con/HM(111) (HM = Pt,Ir) heterostructures grown by intercalation below graphene, which acts surfactant that kinetically stabilizes...
Epitaxial graphene/ferromagnetic metal (Gr/FM) heterostructures deposited onto heavy metals have been proposed for the realization of spintronic devices because their perpendicular magnetic anisotropy and sizable Dzyaloshinskii-Moriya interaction (DMI), allowing both enhanced thermal stability stabilization chiral spin textures. However, establishing routes toward this goal requires fundamental understanding microscopic origin unusual properties. Here, we elucidate nature induced spin-orbit...
Spin Hall and Rashba–Edelstein effects, which are spin-to-charge conversion phenomena due to spin–orbit coupling (SOC), attracting increasing interest as pathways manage rapidly at low consumption cost the storage processing of a large amount data in spintronic devices well more efficient energy harvesting by spin-caloritronics devices. Materials with SOC, such heavy metals (HMs), traditionally employed get conversion. More recently, use graphene (gr) proximity SOC layers has been proposed...
Abstract The Stoner-Wohlfarth (SW) model is the simplest that describes adequately magnetization reversal of nanoscale systems are small enough to contain single magnetic domains. However for larger sizes where multi-domain effects present, e.g., in thin films, this simple macrospin approximation fails and experimental critical curve, referred as SW astroid, far from its predictions. Here we show discrepancy could vanish also extended system. We present a detailed angular-dependent study...
The development of graphene (Gr) spintronics requires the ability to engineer epitaxial Gr heterostructures with interfaces high quality, in which intrinsic properties are modified through proximity a ferromagnet allow for efficient room temperature spin manipulation or stabilization new magnetic textures. These can be prepared controlled way by intercalation different metals. Using photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM), we achieve nanoscale control...
Although technologically challenging, the integration of ferroelectric thin films with graphene spintronics potentially allows realization highly efficient, electrically tuneable, non-volatile memories. Here, atomic layer deposition (ALD) Hf$_{0.5}$Zr$_{0.5}$O$_2$ (HZO) directly on (Gr)/Co/heavy metal (HM) epitaxial stacks is investigated via implementation several nucleation methods. With an in-situ method employing Al$_2$O$_3$ layer, HZO demonstrates a remanent polarization (2Pr) 19.2 $\mu...
Spin currents can modify the magnetic state of ferromagnetic ultrathin films through spin-orbit torque. They may be generated by means interactions either bulk or interfacial phenomena. Electrical transport measurements reveal a 6-fold increase torque accompanied drastic reduction spin Hall magnetoresistance upon introduction an Cu interlayer in Pt/Cu/Co/Pt structure with perpendicular anisotropy. We analyze dependence thickness interlayer, ranging from 0.5 to 15 nm, frame drift diffusion...
We demonstrate the possibility of field-free, ultrafast creation topologically protected nanoscale magnetic skyrmions in ferromagnets via single-pulse laser excitation, holding promise for next-generation memory and logic devices.
The spin-to-charge current interconversion in bilayers composed of ferromagnetic and nonmagnetic layers with strong spin-orbit coupling has garnered considerable attention due to its exceptional potential advancing spintronics devices for data storage logic applications. Platinum (Pt) stands out as one the most effective materials generating spin current. While conversion efficiency is isotropic polycrystalline Pt samples, an ongoing debate persists regarding dependence on crystalline...
The ever-increasing demand for efficient data storage and processing has fueled the search novel memory devices. Spintronics offers an alternative fast solution using spin-to-charge interconversion. In this work, we demonstrate a remarkable thirty-four-fold increase in current conversion when incorporating 2D epitaxial graphene monolayer between iron platinum layers by exploring spin-pumping on-chip Furthermore, find that spin is also anisotropic. We attribute enhancement anisotropy to...
Abstract Electric fields can be employed to efficiently manipulate spin textures in low‐dimensional magnetic systems. In this work, the field‐free formation of skyrmions ferromagnetic‐based patterned nanodots with perpendicular anisotropy and Dzyaloshinskii–Moriya interaction via voltage‐controlled is studied. By micromagnetic simulations it demonstrated that by reducing an electric voltage pulse adequate intensity raise decay times, possible achieve 100% skyrmion nucleation probability...
The realization of novel memory devices is essential due to the increasing requirements in data storage and processing. optimization spin-to-charge interconversion currently one most sought-after topics spintronics, since spin-orbit torque promise a very fast an efficient framework develop them. In this work, we show large enhancement, twenty times, current conversion when inserting atomically-thick epitaxial graphene between iron platinum layers. We measure using spin-pumping (SP)...
The spin-to-charge current interconversion in bilayers composed of ferromagnetic and nonmagnetic layers with strong spin-orbit coupling has garnered considerable attention due to its exceptional potential advancing spintronics devices for data storage logic applications. Platinum (Pt) stands out as one the most effective materials generating spin current. While conversion efficiency is isotropic polycrystalline Pt samples, an ongoing debate persists regarding dependence on crystalline...
Spin polarized currents are employed to efficiently manipulate the magnetization of ferromagnetic ultrathin films by exerting a torque on it. If spin generated means spin-orbit interaction between and non-magnetic layer, effect is known as (SOT), quantified measuring effective fields produced charge current injected into device. In this work, we present new experimental technique quantify directly SOT based measurement non-linearities dc current-voltage (IV) characteristics in Hall bar...
A combination of theoretical modelling and experiments reveals the origin large perpendicular magnetic anisotropy (PMA) that appears in nanometer-thick epitaxial Co films intercalated between graphene (Gr) a heavy metal (HM) substrate, as function thickness. High quality Gr/Co\n/HM(111) (HM=Pt,Ir) heterostructures are grown by intercalation below graphene, which acts surfactant kinetically stabilizes pseudomorphic growth highly perfect face-centered tetragonal ($fct$) films, with reduced...
Direct integration of ferroelectric Hf0.5Zr0.5O2 (HZO) on the inert surface graphene is challenging. Here, using nucleation layers to promote atomic layer deposition HZO was investigated. Different metals were deposited as via dc sputtering. Ta, which oxidizes in air form a sub-stoichiometric oxide, compared Pt, offers more stable electrode. For thicker interlayers, Ta leads unstable switching behavior film. Conversely, at smaller thicknesses, higher Pr can be achieved with an oxidized...