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Title: Anomalous feedback and negative domain wall resistance

Magnetic induction can be regarded as a negative feedback effect, where the motive-force opposes the change of magnetic flux that generates the motive-force. In artificial electromagnetics emerging from spintronics, however, this is not necessarily the case. In this paper, by studying the current-induced domain wall dynamics in a cylindrical nanowire, we show that the spin motive-force exerting on electrons can either oppose or support the applied current that drives the domain wall. The switching into the anomalous feedback regime occurs when the strength of the dissipative torque β is about twice the value of the Gilbert damping constant α. Finally, the anomalous feedback manifests as a negative domain wall resistance, which has an analogy with the water turbine.
Authors:
 [1] ;  [2] ;  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Electrical and Computer Engineering
Publication Date:
Grant/Contract Number:
SC0012509
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. D, Applied Physics
Additional Journal Information:
Journal Volume: 49; Journal Issue: 43; Journal ID: ISSN 0022-3727
Publisher:
IOP Publishing
Research Org:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1473906
Alternate Identifier(s):
OSTI ID: 1328511

Cheng, Ran, Zhu, Jian-Gang, and Xiao, Di. Anomalous feedback and negative domain wall resistance. United States: N. p., Web. doi:10.1088/0022-3727/49/43/434001.
Cheng, Ran, Zhu, Jian-Gang, & Xiao, Di. Anomalous feedback and negative domain wall resistance. United States. doi:10.1088/0022-3727/49/43/434001.
Cheng, Ran, Zhu, Jian-Gang, and Xiao, Di. 2016. "Anomalous feedback and negative domain wall resistance". United States. doi:10.1088/0022-3727/49/43/434001. https://www.osti.gov/servlets/purl/1473906.
@article{osti_1473906,
title = {Anomalous feedback and negative domain wall resistance},
author = {Cheng, Ran and Zhu, Jian-Gang and Xiao, Di},
abstractNote = {Magnetic induction can be regarded as a negative feedback effect, where the motive-force opposes the change of magnetic flux that generates the motive-force. In artificial electromagnetics emerging from spintronics, however, this is not necessarily the case. In this paper, by studying the current-induced domain wall dynamics in a cylindrical nanowire, we show that the spin motive-force exerting on electrons can either oppose or support the applied current that drives the domain wall. The switching into the anomalous feedback regime occurs when the strength of the dissipative torque β is about twice the value of the Gilbert damping constant α. Finally, the anomalous feedback manifests as a negative domain wall resistance, which has an analogy with the water turbine.},
doi = {10.1088/0022-3727/49/43/434001},
journal = {Journal of Physics. D, Applied Physics},
number = 43,
volume = 49,
place = {United States},
year = {2016},
month = {10}
}