Negative dissipation gradients in hysteretic materials
| Autor: | Óscar Iglesias-Freire, Juan José Sáenz, Agustina Asenjo, P. García-Mochales, Miriam Jaafar |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Spins Condensed matter physics business.industry 02 engineering and technology Dissipation 021001 nanoscience & nanotechnology 01 natural sciences Nanomagnet Hysteresis 0103 physical sciences Computer data storage Energy transformation General Materials Science 010306 general physics 0210 nano-technology business Nanomechanics Spin-½ |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Measuring energy dissipation on the nanoscale is of great interest not only for nanomechanics but also to understand important energy transformation and loss mechanisms that determine the efficiency of energy of data storage devices. Fully understanding the magnetic dynamics and dissipation processes in nanomagnets is of major relevance for a number of basic and applied issues from magnetic recording to spin-based sensor devices to biomedical magnetic-based hyperthermia treatments. Here we present experimental evidence for a counter-intuitive monotonical reduction of energy dissipation as the interaction between two nanomagnets is enhanced. This behavior, which takes place when spins are parallel, can be understood in terms of hysteresis phenomena involved in the reorientation of these spins. The measured magnetic losses of about a few femtowatts are in agreement with quasi-static micromagnetic numerical simulations. We gratefully acknowledge funding from projects CSD2010-00024 and MAT2013-48059 (MINECO). |
| Databáze: | OpenAIRE |
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