The late Frasnian rhynchonellid genus <i>Pammegetherhynchus</i> (Brachiopoda)in Poland, and its relevance to the Kellwasser Crisis

The rhynchonellid species, Pammegetherhynchus kowalaensis sp. n., occurs in the late Frasnian (Early to Late Palmatolepis rhenana, and possibly early Palmatolepis linguiformis conodont zones) marly-bituminous succession at Kowala (various outcrops) in the Gałęzice Syncline, south of Kielce in the Holy Cross Mountains, Poland. The only other known species of this genus is the type species, Pammegetherhynchus merodae Sartenaer, 1977, from the late Frasnian (somewhere in the Early and Late Palmatolepis rhenana Zones) of the French Fagne (dark shales of `Matagne' aspect), and, probably, of the Eifel (`Büdesheimer Goniatitenschiefer'). P. kowalaensis sp. n. occurred in level-bottom pioneer assemblages, thriving in reef downslope, mostly poorly-oxygenated habitats of the Kellwasser interval. The species finally disappeared near the Frasnian-Famennian boundary. The genus Pammegetherhynchus seems to be particularly suited to stressed deep-water shelf environments in the European part of the Laurussian shelf, widely distributed in this crisis time

Direct observation of a highly spin-polarized organic spinterface at room temperature

The design of large-scale electronic circuits that are entirely spintronics-driven requires a current source that is highly spin-polarised at and beyond room temperature, cheap to build, efficient at the nanoscale and straightforward to integrate with semiconductors. Yet despite research within several subfields spanning nearly two decades, this key building block is still lacking. We experimentally and theoretically show how the interface between Co and phthalocyanine molecules constitutes a promising candidate. Spin-polarised direct and inverse photoemission experiments reveal a high degree of spin polarisation at room temperature at this interface. We measured a magnetic moment on the molecules's nitrogen pi orbitals, which substantiates an ab-initio theoretical description of highly spin-polarised charge conduction across the interface due to differing spinterface formation mechanims in each spin channel. We propose, through this example, a recipe to engineer simple organic-inorganic interfaces with remarkable spintronic properties that can endure well above room temperature

Magnetoresistance through a single molecule

The use of single molecules to design electronic devices is an extremely challenging and fundamentally different approach to further downsizing electronic circuits. Two-terminal molecular devices such as diodes were first predicted [1] and, more recently, measured experimentally [2]. The addition of a gate then enabled the study of molecular transistors [3-5]. In general terms, in order to increase data processing capabilities, one may not only consider the electron's charge but also its spin [6,7]. This concept has been pioneered in giant magnetoresistance (GMR) junctions that consist of thin metallic films [8,9]. Spin transport across molecules, i.e. Molecular Spintronics remains, however, a challenging endeavor. As an important first step in this field, we have performed an experimental and theoretical study on spin transport across a molecular GMR junction consisting of two ferromagnetic electrodes bridged by a single hydrogen phthalocyanine (H2Pc) molecule. We observe that even though H2Pc in itself is nonmagnetic, incorporating it into a molecular junction can enhance the magnetoresistance by one order of magnitude to 52%.Comment: To appear in Nature Nanotechnology. Present version is the first submission to Nature Nanotechnology, from May 18th, 201

Polaron spin current transport in organic semiconductors

In spintronics, pure spin currents play a key role in transmitting, processing and storing information. A pure spin current is a flow of electron spin angular momentum without a simultaneous flow of charge current. It can be carried by conduction electrons or magnons and has been studied in many inorganic metals, semiconductors and insulators, but not yet in organic semiconductors. Charge carriers in π-conjugated organic materials are localized spin-1/2 polarons which move by hopping, but the mechanisms of their spin transport and relaxation are not well understood. Here we use ferromagnetic resonance spin pumping in a ferromagnet/conjugated polymer/nonmagnetic spin-sink trilayer to demonstrate the ability of polarons to carry pure spin currents over hundreds of nanometres with long spin relaxation times of up to a millisecond and to exhibit Hanle precession. By systematically comparing charge and spin transport on the same trilayer we show that spin-orbit coupling mediates spin relaxation at room temperature.This work was supported by the Cabinet Office, Government of Japan through its “Funding Program for Next Generation World-Leading Researchers”, PRESTO-JST “Innovative nano-electronics through interdisciplinary collaboration among material, device and system layers”, the Asahi Glass Foundation and the Engineering and Physical Sciences Research Council (EPSRC).This is the accepted version of the article. The final version was published in Nature Physics and is available at http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys2901.html. Nature Publishing Group's licence and reuse policy is available at http://www.nature.com/authors/policies/license.html

Public Sphere Within the Framework of Helmut Plessner's Political Anthropology

The author of the article presents and analyzes the concept of the public sphere which was created by Plessner in the twenties of the twentieth century. It includes the main work of Plessner written in 1923, The Limits of Community: A Critique of Social Radicalism. This book presents two forms of public life organisation: community and society. Plessner shows the important differences in the understanding of the role of the individual in these two forms of human collectivity organisation. Plessner creates its own versions of anthropology for understanding the possibility of different treatment of individuals in the community and in society. He presented this concept in the paper entitled Conditio humana in 1961 which represents one of the main works of political anthropology in the twentieth century. His research effort focuses on the presentation of the role of the public sphere in the social life. Its important characteristic is neutral behavior of people performing the roles in social life. According to Plessner, there are two types of community: a blood-based type and an ideal-based type both of which aspire to control the public sphere. The meaning of Plessner's concept is very broad; both for explaining the totalitarianism creation in Germany as well as for discovering a deeper sense of political changes in the modern world

Topical Value of Wilhelm Röpke's Three Orders for Creation of Public Policy

Normative concept of The Social-Economic order proposed by Wilhelm Röpke allows for the valuation of the modern shape of Capitalism. In the introduction the author has attempted to show the actual problems faced by current Public Policy such as reinstatement of the socially accepted order of freedom during era of oligopolistic-corporate-finance oriented capitalism, fight against asymmetric distribution of wealth and&nbsp; management of sustainable Immigration Policy. Wilhelm Röpke was a member of a group called “Ordo liberals”. According to the Ortoliberals the public policy needs to allow most possible freedoms to all citizens (including economic free market freedoms). At the same time, the Ortoliberals want to be active in preparing the Public Policy which would prepare a platform for effective economy, fair justice system and equal opportunity for all members of society. According to Ortoliberalism, administrative actions need to follow the principle of subsidiarity. The Public Policy must also ensure social justice and protection of dignity for the whole population, as expected in the society governed by Social Solidarity