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  1. Article ; Online: Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe)

    Cecchi, Stefano / Momand, Jamo / Dragoni, Daniele / Abou El Kheir, Omar / Fagiani, Federico / Kriegner, Dominik / Rinaldi, Christian / Arciprete, Fabrizio / Holý, Vaclav / Kooi, Bart J / Bernasconi, Marco / Calarco, Raffaella

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 11, Issue 1, Page(s) e2304785

    Abstract: The possibility to engineer (GeTe) ...

    Abstract The possibility to engineer (GeTe)
    Language English
    Publishing date 2023-11-21
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202304785
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Thin-Film Heterostructures Based on Co/Ni Synthetic Antiferromagnets on Polymer Tapes: Toward Sustainable Flexible Spintronics.

    Hassan, Mariam / Laureti, Sara / Rinaldi, Christian / Fagiani, Federico / Barucca, Gianni / Casoli, Francesca / Mezzi, Alessio / Bolli, Eleonora / Kaciulis, Saulius / Fix, Mario / Ullrich, Aladin / Albrecht, Manfred / Varvaro, Gaspare

    ACS applied materials & interfaces

    2022  Volume 14, Issue 45, Page(s) 51496–51509

    Abstract: Synthetic antiferromagnets with perpendicular magnetic anisotropy (PMA-SAFs) have gained growing attention for both conventional and next-generation spin-based technologies. While the progress of PMA-SAF spintronic devices on rigid substrates has been ... ...

    Abstract Synthetic antiferromagnets with perpendicular magnetic anisotropy (PMA-SAFs) have gained growing attention for both conventional and next-generation spin-based technologies. While the progress of PMA-SAF spintronic devices on rigid substrates has been remarkable, only few examples of flexible thin-film heterostructures are reported in the literature, all containing platinum group metals (PGMs). Systems based on Co/Ni may offer additional advantages with respect to devices containing PGMs, i.e., low damping and high spin polarization. Moreover, limiting the use of PGMs may relieve the demand for critical raw materials and reduce the environmental impact of related technologies, thus contributing to the transition toward a more sustainable future. Here, we discuss for the first time the realization of Co/Ni-based PMA-SAFs on polymer tapes and exploit it to obtain flexible giant magneto-resistive spin valves (GMR-SVs) with perpendicular magnetic anisotropy. Several combinations of buffer and capping layers (i.e., Pt, Pd, and Cu/Ta) are also investigated. High-quality flexible SAFs with a fully compensated antiferromagnetic region and SVs with a sizable GMR ratio (up to 4.4%), in line with the values reported in the literature for similar systems on rigid substrates, were obtained in all cases. However, we demonstrate that PGMs allows achieving the best results when used as a buffer layer, while Cu is the best choice as a capping layer to optimize the properties of the stacks. We justify the role of buffer and capping layers in terms of different interdiffusion mechanisms occurring at the interface between the metallic layers. These results, along with the high robustness of the samples' properties against bending (up to 180°), indicate that complex and bendable Co/Ni-based heterostructures with reduced content of PGMs can be obtained on flexible tapes, allowing for the development of novel flexible and sustainable spintronic devices for applications in many fields including wearable electronics, soft robotics, and biomedicine.
    Language English
    Publishing date 2022-11-01
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c14000
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: A Lab-On-chip Tool for Rapid, Quantitative, and Stage-selective Diagnosis of Malaria.

    Giacometti, Marco / Milesi, Francesca / Coppadoro, Pietro Lorenzo / Rizzo, Alberto / Fagiani, Federico / Rinaldi, Christian / Cantoni, Matteo / Petti, Daniela / Albisetti, Edoardo / Sampietro, Marco / Ciardo, Mariagrazia / Siciliano, Giulia / Alano, Pietro / Lemen, Brigitte / Bombe, Joel / Nwaha Toukam, Marie Thérèse / Tina, Paul Fernand / Gismondo, Maria Rita / Corbellino, Mario /
    Grande, Romualdo / Fiore, Gianfranco Beniamino / Ferrari, Giorgio / Antinori, Spinello / Bertacco, Riccardo

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2021  Volume 8, Issue 14, Page(s) 2004101

    Abstract: Malaria remains the most important mosquito-borne infectious disease worldwide, with 229 million new cases and 409.000 deaths in 2019. The infection is caused by a protozoan parasite which attacks red blood cells by feeding on hemoglobin and transforming ...

    Abstract Malaria remains the most important mosquito-borne infectious disease worldwide, with 229 million new cases and 409.000 deaths in 2019. The infection is caused by a protozoan parasite which attacks red blood cells by feeding on hemoglobin and transforming it into hemozoin. Despite the WHO recommendation of prompt malaria diagnosis, the quality of microscopy-based diagnosis is frequently inadequate while rapid diagnostic tests based on antigens are not quantitative and still affected by non-negligible false negative/positive results. PCR-based methods are highly performant but still not widely used in endemic areas. Here, a diagnostic tool (TMek), based on the paramagnetic properties of hemozoin nanocrystals in infected red blood cells (i-RBCs), is reported on. Exploiting the competition between gravity and magnetic forces, i-RBCs in a whole blood specimen are sorted and electrically detected in a microchip. The amplitude and time evolution of the electrical signal allow for the quantification of i-RBCs (in the range 10-10
    MeSH term(s) Erythrocytes/parasitology ; Evaluation Studies as Topic ; Humans ; Lab-On-A-Chip Devices ; Malaria/diagnosis ; Reproducibility of Results ; Sensitivity and Specificity
    Language English
    Publishing date 2021-05-13
    Publishing country Germany
    Document type Evaluation Study ; Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202004101
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Room-temperature ferroelectric switching of spin-to-charge conversion in GeTe

    Varotto, Sara / Nessi, Luca / Cecchi, Stefano / Sławińska, Jagoda / Noël, Paul / Petrò, Simone / Fagiani, Federico / Novati, Alessandro / Cantoni, Matteo / Petti, Daniela / Albisetti, Edoardo / Costa, Marcio / Calarco, Raffaella / Nardelli, Marco Buongiorno / Bibes, Manuel / Picozzi, Silvia / Attané, Jean-Philippe / Vila, Laurent / Bertacco, Riccardo /
    Rinaldi, Christian

    2021  

    Abstract: Since its birth in the 1990s, semiconductor spintronics has suffered from poor compatibility with ferromagnets as sources of spin. While the broken inversion symmetry of some semiconductors may alternatively allow for spin-charge interconversion, its ... ...

    Abstract Since its birth in the 1990s, semiconductor spintronics has suffered from poor compatibility with ferromagnets as sources of spin. While the broken inversion symmetry of some semiconductors may alternatively allow for spin-charge interconversion, its control by electric fields is volatile. Ferroelectric Rashba semiconductors stand as appealing materials unifying semiconductivity, large spin-orbit coupling, and non-volatility endowed by ferroelectricity. However, their potential for spintronics has been little explored. Here, we demonstrate the non-volatile, ferroelectric control of spin-to-charge conversion at room temperature in epitaxial GeTe films. We show that ferroelectric switching by electrical gating is possible in GeTe despite its high carrier density. We reveal a spin-to-charge conversion as effective as in Pt, but whose sign is controlled by the orientation of the ferroelectric polarization. The comparison between theoretical and experimental data suggests that spin Hall effect plays a major role for switchable conversion. These results open a route towards devices combining spin-based logic and memory integrated into a silicon-compatible material.

    Comment: 21 pages, 4 figures
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2021-03-13
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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