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Jaafar M, Iglesias-Freire Ó, García-Mochales P, et al. Negative dissipation gradients in hysteretic materials. Nanoscale. 2016;8(38):16989-16994doi: 10.1039/c6nr04356a.
Jaafar, M., Iglesias-Freire, �. �., García-Mochales, P., Sáenz, J. J., & Asenjo, A. (2016). Negative dissipation gradients in hysteretic materials. Nanoscale, 8(38), 16989-16994. https://doi.org/10.1039/c6nr04356a
Jaafar, Miriam, et al. "Negative dissipation gradients in hysteretic materials." Nanoscale vol. 8,38 (2016): 16989-16994. doi: https://doi.org/10.1039/c6nr04356a
Jaafar M, Iglesias-Freire Ó, García-Mochales P, Sáenz JJ, Asenjo A. Negative dissipation gradients in hysteretic materials. Nanoscale. 2016 Sep 29;8(38):16989-16994. doi: 10.1039/c6nr04356a. PMID: 27722376.
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Nanoscale. 2016 Sep 29;8(38):16989-16994. doi: 10.1039/c6nr04356a.

Negative dissipation gradients in hysteretic materials.

Nanoscale

Miriam Jaafar, Óscar Iglesias-Freire, Pedro García-Mochales, Juan José Sáenz, Agustina Asenjo

Affiliations

  1. Instituto de Ciencia de Materiales de Madrid-CSIC, 28049 Madrid, Spain. [email protected].
  2. Instituto de Ciencia de Materiales de Madrid-CSIC, 28049 Madrid, Spain. [email protected] and Department of Physics, McGill University, Montreal, H3A 2T8, Canada.
  3. Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
  4. Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain. [email protected] and IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.

PMID: 27722376 DOI: 10.1039/c6nr04356a

Abstract

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.

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