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Green information technologies: Superconductivity meets spintronics -- ScienceDaily
Science News from research organizations 1 . 2 . Green information technologies: Superconductivity meets spintronics . Date: December 2, 2021 Source: Helmholtz-Zentrum Berlin für Materialien und Energie Summary: Superconducting coupling between two regions separated by a one micron wide ferromagnetic compound has been proved by an international team. This macroscopic quantum effect, known as Josephson effect, generates an electrical current within the ferromagnetic compound made of superconducting Cooper-pairs. Magnetic imaging of the ferromagnetic region at BESSY II has contributed to demonstrate that the spin of the electrons forming the Cooper pairs are equal. These results pave the way for low-power consumption superconducting spintronic-applications where spin-polarized currents can be protected by quantum coherence. Share: FULL STORY When two superconducting regions are separated by a strip of non-superconducting material, a special quantum effect can occur, coupling both regions: The Josephson effect. If the spacer material is a half-metal ferromagnet novel implications for spintronic applications arise. An international team has now for the first time designed a material system that exhibits an unusually long-range Josephson effect: Here, regions of superconducting YBa 2 Cu 3 O 7 are separated by a region of half-metallic, ferromagnetic manganite (La 2/3 Sr 1/3 MnO 3 ) one micron wide. advertisement With the help of magneto-transport measurements, the researchers were able to demonstrate the presence of a supercurrent circulating through the manganite -- this supercurrent is arising from the superconducting coupling between both superconducting regions, and thus a manifestation of a Josephson effect with a macroscopic long range. Extremely rare: Triplett superconductivity In addition, the scientists explored another interesting property with profound consequences for spintronic applications. In superconductors electrons pair together in so-called Cooper pairs. In the vast majority of superconducting materials these pairs are composed by electrons with opposite spin in order to minimise the magnetic exchange field which is detrimental for the stabilisation of superconductivity. The ferromagnet used by the international team has been a half-ferromagnet for which only one spin type electron is allowed to circulate. The fact that a supercurrent has been detected within this material, implies that the Cooper pairs of this supercurrent must be composed by electrons having the same spin. This so-called "triplet" superconductivity is extremely rare. Mapping magnetic domains at BESSY II "At the XMCD-PEEM station at BESSY II, we mapped and measured the magnetic domains within the manganite spacer. We observed wide regions homogeneously magnetised and connecting the superconducting regions. Triplet spin pairs can propagate freely in these," explains Dr. Sergio Valencia Molina, HZB physicist, who supervised the measurements at BESSY II. Superconducting currents flow without resistance which make them very appealing for low-power consumption applications. In the present case this current is made of electrons with equal spins. Such spin polarised currents could be used in novel superconducting spintronic applications for the transport (over long distances) and reading/writing of information while profiting from the stability imposed by the macroscopic quantum coherence of the Josephson effect. The new device made of the superconducting and ferromagnetic components therefore opens up opportunities for superconducting spintronics and new perspectives for quantum computing. make a difference: sponsored opportunity Story Source: Materials provided by Helmholtz-Zentrum Berlin für Materialien und Energie . Note: Content may be edited for style and length. Journal Reference : D. Sanchez-Manzano, S. Mesoraca, F. A. Cuellar, M. Cabero, V. Rouco, G. Orfila, X. Palermo, A. Balan, L. Marcano, A. Sander, M. Rocci, J. Garcia-Barriocanal, F. Gallego, J. Tornos, A. Rivera, F. Mompean, M. Garcia-Hernandez, J. M. Gonzalez-Calbet, C. Leon, S. Valencia, C. Feuillet-Palma, N. Bergeal, A. I. Buzdin, J. Lesueur, Javier E. Villegas, J. Santamaria. Extremely long-range, high-temperature Josephson coupling across a half-metallic ferromagnet . Nature Materials , 2021; DOI: 10.1038/s41563-021-01162-5 . Cite This Page : MLA . APA . Chicago . Helmholtz-Zentrum Berlin für Materialien und Energie. "Green information technologies: Superconductivity meets spintronics." ScienceDaily. ScienceDaily, 2 December 2021. . Helmholtz-Zentrum Berlin für Materialien und Energie. (2021, December 2). Green information technologies: Superconductivity meets spintronics. ScienceDaily . Retrieved December 3, 2021 from www.sciencedaily.com/releases/2021/12/211202132440.htm Helmholtz-Zentrum Berlin für Materialien und Energie. "Green information technologies: Superconductivity meets spintronics." ScienceDaily. www.sciencedaily.com/releases/2021/12/211202132440.htm (accessed December 3, 2021). RELATED TOPICS Matter & Energy Spintronics . Materials Science . Physics . Quantum Computing . Computers & Math Spintronics Research . Quantum Computers . Computers and Internet . Information Technology . advertisement RELATED TERMS Quantum entanglement . Transformer . Phase (matter) . Quantum dot . Quantum number . Magnetic resonance imaging . Superconducting Super Collider . 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Physicists have discovered that superconducting nanowires made of MoGe alloy undergo quantum phase transitions from a superconducting to a normal metal state when placed in an increasing magnetic ... FROM AROUND THE WEB ScienceDaily shares links with sites in the TrendMD network and earns revenue from third-party advertisers, where indicated. .
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