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177 research outputs found

A century of Public Administration: Traveling through time and topics

Author: Hattke Fabian
Vogel Rick
Publication venue: 'Wiley'
Publication date: 01/01/2022
Field of study

Public Administration (PA) has been a unique witness and protagonist of scholarship in the field of public administration over the course of an entire century. On the occasion of the journal's 100th anniversary, we conduct a systematic analysis of the publication history using bibliometric methods enhanced by natural language processing. The findings show how disciplinary influences, geographical settings, and methodological orientations have changed over time. In our main analysis, we extract 63 thematic clusters on the basis of linguistic similarities and track their evolution through five eras of PA scholarship. Overall, the results show both the journal's strong British roots and its evolvement toward an increasingly international, interdisciplinary, and dynamic community. The findings also indicate the state of the field as a “fragmented adhocracy,” with changing modes of differentiation over time.publishedVersio

University of Bergen

Adiabatic Control of Spin-Wave Propagation using Magnetisation Gradients

Author: Aßmann Rick
Chumak Andrii V.
Hillebrands Burkard
Pirro Philipp
Vogel Marc
von Freymann Georg
Publication venue: 'Springer Science and Business Media LLC'
Publication date: 01/11/2017
Field of study

Spin waves are of large interest as data carriers for future logic devices. However, due to the strong anisotropic dispersion relation of dipolar spin-waves in in-plane magnetised films the realisation of two-dimensional information transport remains a challenge. Bending of the energy flow is prohibited since energy and momentum of spin waves cannot be conserved while changing the direction of wave propagation. Thus, non-linear or non-stationary mechanisms are usually employed. Here, we propose to use reconfigurable laser-induced magnetisation gradients to break the system's translational symmetry. The resulting changes in the magnetisation shift the dispersion relations locally and allow for operating with different spin-wave modes at the same frequency. Spin-wave momentum is first transformed via refraction at the edge of the magnetisation gradient region and then adiabatically modified inside it. Along these lines the spin-wave propagation direction can be controlled in a broad frequency range with high efficiency

arXiv.org e-Print Archive

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