Tunability versus deviation sensitivity in a nonlinear vortex oscillator

Martin, S. Y.; Thirion, C.; Hoarau, Christophe; Baraduc, C.; Diény, B.

doi:10.1103/physrevb.88.024421

Cited by 17 publications

(10 citation statements)

References 13 publications

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“…These first experiments were followed by a multitude of experiments in different devices and geometries and the development of the necessary theoretical framework for their description. Besides studies on pointcontacts [159][160][161], where, for instance, the parametric generation and emission of propagating spin waves due to a frequency mismatch between the oscillator and the microwave pumping was demonstrated [159], experiments were extended to STNO incorporating magnetic tunneling junctions (MTJ) [138,[169][170][171], free layers in the magnetic vortex configuration [162][163][164][165][166][167] and, more recently, to spin-Hall-effect driven STNOs [172].…”

Section: Parametric Synchronization and Parametric Excitation In Spinmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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Magnonics and magnon spintronics aim at the utilization of spin waves and magnons, their quanta, for the construction of wave-based logic networks via the generation of pure all-magnon spin currents and their interfacing with electrical charge transport. The promise of efficient parallel data processing and low power consumption renders this field one of the most promising research areas in spintronics. In this context, the process of parallel parametric amplification, i.e., the conversion of microwave photons into magnons at one half of the microwave frequency, has proven to be a versatile tool to excite and to manipulate spin waves. Its beneficial and unique properties such as frequency and mode-selectivity, the possibility to excite spin waves in a wide wavevector range and the creation of phase-correlated wave pairs, have enabled the achievement of important milestones like the magnon Bose Einstein condensation and the cloning and trapping of spinwave packets. Parallel parametric amplification, which allows for the selective amplification of magnons while conserving their phase is, thus, one of the key methods of spin-wave generation and amplification.The application of parallel parametric amplification to CMOS-compatible micro-and nanostructures is an important step towards the realization of magnonic networks. This is motivated not only by the fact that amplifiers are an important tool for the construction of any extended logic network but also by the unique properties of parallel parametric amplification. In particular, the creation of phase-correlated wave pairs allows for rewarding alternative logic operations such as a phase-dependent amplification of the incident waves. Recently, the successful application of parallel parametric amplification to metallic microstructures has been reported which constitutes an important milestone for the application of magnonics in practical devices. It has been demonstrated that parametric amplification provides an excellent tool to generate and to amplify spin waves in these systems in a wide wavevector range. In particular, the amplification greatly benefits from the discreteness of the spin-wave spectra since the size of the microstructures is comparable to the spin-wave wavelength. This opens up new, interesting routes of spin-wave amplification and manipulation. In this Review, we will give an overview over the recent developments and achievements in this field.

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Section: Parametric Synchronization and Parametric Excitation In Spinmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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“…It is somewhat surprising to observe the above trend plateauing over the last two decades, when the average number of citations made by papers in the APS increased [17], and the incorporation of citations and bibliometric indicators in academic decision-making witnessed further increase [37]. Yet, this is accompanied by a widening gap between the observed reciprocity taking place between coauthors (which, after the 1990s accounts for almost half of the whole network's reciprocity), and the expected level of reciprocity between coauthors in our null model.…”

Section: Discussionmentioning

confidence: 99%

“…These two seemingly at odds trends might be related to the onset of the Internet, which dramatically reduced barriers to access to published research. We speculate that the expansion of the Internet might have, on average, widened a scientist's potential pool of authors to cite [17], therefore diluting the overall reciprocity in the scientific community while at the same time resulting in a more prominent role of the exchanged citations between collaborators and colleagues.…”

Section: Discussionmentioning

confidence: 99%

“…Self-citations and their role in inflating bibliometric indicators have been studied extensively [18]. Several scholars have proposed revised metrics to mitigate their distorting impact [19], and indeed some of the most popular citation indexing services (e.g., Web of Science) and social networking sites for scientists (e.g., ResearchGate) provide detailed author-specific bibliometric information with and without the contribution of self-citations.Yet, very little attention has been paid to the scientific community's collective response to the increasing adoption of bibliometric indicators, and whether this ultimately resulted in more sophisticated citation patterns involving collaborators and colleagues [17,20]. Indeed, the quest for higher citation counts generates an obvious incentive for scientists to exchange citations with their closest circle of coauthors and collaborators.…”

mentioning

confidence: 99%

“…Yet, very little attention has been paid to the scientific community's collective response to the increasing adoption of bibliometric indicators, and whether this ultimately resulted in more sophisticated citation patterns involving collaborators and colleagues [17,20]. Indeed, the quest for higher citation counts generates an obvious incentive for scientists to exchange citations with their closest circle of coauthors and collaborators.…”

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confidence: 99%

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Reciprocity and Success in Academic Careers

Aste

Caccioli

et al. 2018

SSRN Journal

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The growing importance of citation-based bibliometric indicators in shaping the prospects of academic careers incentivizes scientists to boost the numbers of citations they receive. Whereas the exploitation of self-citations has been extensively documented, the impact of re-ciprocated citations has not yet been studied. We study reciprocity in a citation network of authors, and compare it with the average reciprocity computed in an ensemble of null network models. We show that obtaining citations through reciprocity correlates negatively with a successful career in the long term. Nevertheless, at the aggregate level we show evidence of a steady increase in reciprocity over the years, largely fuelled by the exchange of citations between coauthors. Our results characterize the structure of author networks in a time of increasing emphasis on citation-based indicators, and we discuss their implzications towards a fairer assessment of academic impact.The majority of measures that evaluate academic impact are based on citations of publications. Ranging from crude citation counts to the well known journal impact factor [1], the Eigenfactor metrics for journal rankings [2] and the h-index [3] for authors, such measures are increasingly relied upon to inform all aspects of academic decision-making, including faculty recruiting, grant attribution, and the formation of collaborations [4]. The onset of such a trend dates back to the 1950s, when the earliest citation-based indices to assess academic impact were put forward [5]. The following decades saw the proliferation and ever-increasing adoption of such indicators in all fields of science [6,7], which eventually led to the systematic analysis of academic citations, to the emergence of bibliometrics as a research field [8], and, more recently, to the rise of a "science of science" devoted to understanding the determinants of scientific success [9][10][11].Given the importance that citations play nowadays in shaping the prospects of an academic career, it is certainly not surprising to see an increased attention to the study of citation patterns and of the publication strategies that can attract a larger number of citations. While an author's productivity and the quality of her work are obvious determinants of academic success [12], other less tangible aspects have recently been identified as key contributors to success. For example, the social network a scientist is embedded in has recently been shown to play a relevant role in determining her future chances of success [13].Other social and behavioural considerations also play relevant roles in modern academic reputation systems, especially concerning the proliferation of self-citations and citations between close collaborators [14-17]. Self-citations and their role in inflating bibliometric indicators have been studied extensively [18]. Several scholars have proposed revised metrics to mitigate their distorting impact [19], and indeed some of the most popular citation indexing services (e.g., Web of Science) and social ne...

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