Local moment formation and magnetic coupling of Mn dopants in Bi2Se3: A low-temperature ferromagnetic resonance study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10378497" target="_blank" >RIV/00216208:11320/18:10378497 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/18:00490258
Result on the web
<a href="https://doi.org/10.1016/j.physb.2017.10.016" target="_blank" >https://doi.org/10.1016/j.physb.2017.10.016</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physb.2017.10.016" target="_blank" >10.1016/j.physb.2017.10.016</a>
Alternative languages
Result language
angličtina
Original language name
Local moment formation and magnetic coupling of Mn dopants in Bi2Se3: A low-temperature ferromagnetic resonance study
Original language description
We compare the magnetic and electronic configuration of single Mn atoms in molecular beam epitaxy (MBE) grown Bi2Se3 thin films, focusing on electron paramagnetic (ferromagnetic) resonance (EPR and FMR, respectively) and superconducting quantum interference device (SQUID) techniques. X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) reveal the expected increase of disorder with increasing concentration of magnetic guest atoms, however, Kikuchi patterns show that disorder consists majorly of mu m-scale 60 degrees twin domains in the hexagonal Bi2Se3 structure, which are promoted by the presence of single unclustered Mn impurities. Ferromagnetism below T-C similar to (5.4 +/- 0.3) K can be well described by critical scaling laws M(T)similar to(1-T/T-C)(beta) with a critical exponent beta = (0.34 +/- 0.2), suggesting 3D Heisenberg class magnetism instead of e.g. 2D-type coupling between Mn-spins in van der Waals gap sites. From EPR hyperfine structure data we determine a Mn2+ (d(5), S = 5/2) electronic configuration with a g-factor of 2.002 for -1/2 -> +1/2 transitions. In addition, from the strong dependence of the low temperature FMR fields and linewidth on the field strength and orientation with respect to the Bi2Se3 (0001) plane, we derive magnetic anisotropy energies of up to K-1 = -3720 erg/cm(3) in MBE-grown Mn-doped Bi2Se3, reflecting the first order magneto-crystalline anisotropy of an in-plane magnetic easy plane in a hexagonal (0001) crystal symmetry. We observe an increase of K-1 with increasing Mn concentration, which we interpret to be correlated to a Mn-induced in-plane lattice contraction. Across the ferromagnetic-paramagnetic transition the FMR intensity is suppressed and resonance fields converge the paramagnetic limit of Mn2+ (d(5), S = 5/2).
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physica B: Condensed Matter
ISSN
0921-4526
e-ISSN
—
Volume of the periodical
536
Issue of the periodical within the volume
květen
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
604-613
UT code for WoS article
000431075600138
EID of the result in the Scopus database
2-s2.0-85033225097