Dephasing-Assisted Macrospin Transport

• Main Authors: Stefano Iubini, Simone Borlenghi, Anna Delin, Stefano Lepri, Francesco Piazza
• Format: Article
• Language: English
• Published: MDPI AG 2020-02-01
• Series: Entropy
• Subjects: noise and transport; micromagnetic simulations; discrete nonlinear schrödinger model; open systems
• Online Access: https://www.mdpi.com/1099-4300/22/2/210

Transport phenomena are ubiquitous in physics, and it is generally understood that the environmental disorder and noise deteriorates the transfer of excitations. There are, however, cases in which transport can be enhanced by fluctuations. In the present work, we show, by means of micromagnetics simulations, that transport efficiency in a chain of classical macrospins can be greatly increased by an optimal level of dephasing noise. We also demonstrate the same effect in a simplified model, the dissipative Discrete Nonlinear Schrödinger equation, subject to phase noise. Our results point towards the realization of a large class of magnonics and spintronics devices, where disorder and noise can be used to enhance spin-dependent transport efficiency.