Sliding conductivity of a magnetic kink crystal in a chiral helimagnet / Kishine Jun-ichiro,Ovchinnikov A. S.,Proskurin I. V. // PHYSICAL REVIEW B. - 2010. - V. 82, l. 6.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

We derive a current-driven sliding conductivity of the magnetic kink crystal (MKC) in chiral helimagnet under weak magnetic field applied perpendicular to the helical axis. For this purpose, we discuss the correlated dynamics of quantum-mechanical itinerant spins and the MKC which are coupled via the sd exchange interaction. The itinerant spins are treated as fully quantum-mechanical operators whereas the dynamics of the MKC is considered within classical Lagrangian formalism. By appropriately treating elementary excitations around the MKC state, we construct coupled equations of motion for the collective coordinates (the center-of-mass position and quasi-zero-mode coordinate) associated with the sliding motion of the MKC. By solving them, we demonstrate that the correlated dynamics is understood through a hierarchy of two time scales: Boltzmann relaxation time tau(el), when a nonadiabatic spin-transfer torque appears, and Gilbert damping time tau(MKC), when adiabatic spin-transfer torque comes up. As a notable consequence, we found that the terminal velocity of the sliding motion reverses its sign depending on the band-filling ratio of the conduction electron system.

Author keywords:

DOMAIN-WALL; HELICOIDAL STRUCTURES; ANTIFERROMAGNETS; FERROMAGNETISM; CR1/3NBS2; SOLIDS; MOTION

DOI:

10.1103/PhysRevB.82.064407

Web of Science ID:

ISI:000280688900005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	AUG 6
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	064407
Keywords-Plus	DOMAIN-WALL; HELICOIDAL STRUCTURES; ANTIFERROMAGNETS; FERROMAGNETISM; CR1/3NBS2; SOLIDS; MOTION
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Kishine, Jun-ichiro/C-1743-2015 Ovchinnikov, Alexander/B-9906-2009
ORCID-Numbers	Kishine, Jun-ichiro/0000-0001-6162-7067 Proskurin, Igor/0000-0002-0314-2237 Ovchinnikov, Alexander/0000-0002-1173-9260
Funding-Acknowledgement	Ministry of Education, Culture, Sports, Science and Technology, Japan {[}19540371]; RFBR {[}10-02-00098-a]
Funding-Text	J.-i.K. acknowledges Grant-in-Aid for Scientific Research (C) (Grant No. 19540371) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. A.S.O. and I. V. P. acknowledge RFBR under Grant No. 10-02-00098-a.
Number-of-Cited-References	41
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	31
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	635WT