Universität zu Köln

Bauer, A., Garst, M. and Pfleiderer, C. (2016). History dependence of the magnetic properties of single-crystal Fe1-xCoxSi. Phys. Rev. B, 93 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report the magnetization, ac susceptibility, and specific heat of optically float-zoned single crystals of Fe1-xCoxSi, 0.20 <= x <= 0.50. We determine the magnetic phase diagrams for all major crystallographic directions and cooling histories. After zero-field cooling, the phase diagrams resemble that of the archetypal stoichiometric cubic chiral magnet MnSi. Besides the helical and conical state, we observe a pocket of skyrmion lattice phase just below the helimagnetic ordering temperature. At the phase boundaries between these states evidence for slow dynamics is observed. When the sample is cooled in small magnetic fields, the phase pocket of skyrmion lattice may persist metastably down to the lowest temperatures. Taken together with the large variation in the transition temperatures, transition fields, and helix wavelength as a function of the composition, this hysteresis identifies Fe1-xCoxSi as an ideal material for future experiments exploring, for instance, the topological unwinding of the skyrmion lattice.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bauer, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfleiderer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-272108
DOI:	10.1103/PhysRevB.93.235144
Journal or Publication Title:	Phys. Rev. B
Volume:	93
Number:	23
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ITINERANT-ELECTRON FERROMAGNETISM; REAL-SPACE OBSERVATION; NON-FERMI-LIQUID; SPIN FLUCTUATIONS; SKYRMION LATTICE; FEXCO1-XSI; STATE; MAGNETORESISTANCE; TEMPERATURE; RESONANCE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27210