Ferromagnetic Layers in a Topological Insulator (Bi,Sb)2Te3 Crystal Doped with Mn

Ferromagnetic Layers in a Topological Insulator (Bi,Sb)2Te3 Crystal Doped with Mn Full article

Journal

ACS Nano
ISSN: 1936-0851

Output data

Year: 2022, Volume: 16, Number: 12, Pages: 20831-20841 Pages count : 11 DOI: 10.1021/acsnano.2c08217

Authors

Frolov Alexander S. ^1,2 , Usachov Dmitry Yu. ³ , Fedorov Alexander V. ⁴ , Vilkov Oleg Yu. ³ , Golyashov Vladimir ^5,6 , Tereshchenko Oleg E. ^5,6 , Bogomyakov Artem S. ⁷ , Kokh Konstantin ^8,9 , Muntwiler Matthias ¹⁰ , Amati Matteo ¹¹ , Gregoratti Luca ¹¹ , Sirotina Anna P. ^2,12 , Abakumov Artem M. ¹³ , Sánchez-Barriga Jaime ^4,14 , Yashina Lada V. ^1,2

Affiliations

1	Lomonosov Moscow State University, Leninskie Gory 1/3, 119991Moscow, Russia
2	N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, 119991Moscow, Russia
3	St. Petersburg State University, 7/9 Universitetskaya nab., 199034St. Petersburg, Russia
4	Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, 12489Berlin, Germany
5	Novosibirsk State University, ul. Pirogova 2, 630090Novosibirsk, Russia
6	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, pr. Nikolsky 1, 630559Kol’tsovo, Russia
7	International Tomography Center, SB RAS, Institutskaya, 3a, Novosibirsk630090, Russia
8	Kemerovo State University, Kemerovo, 650000, Russia
9	Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Koptyuga pr. 3, 630090Novosibirsk, Russia
10	Photon Science Division, Paul Scherrer Institute, 5232Villigen PSI, Switzerland
11	Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, Strada Statale 14, Km 163.5, Basovizza, Trieste34149, Italy
12	Institute of Nanotechnology of Microelectronics RAS, Nagatinskaya str., 16A/11, 115487Moscow, Russia
13	Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026Moscow, Russia
14	IMDEA Nanoscience, C/Faraday 9, Campus de Cantoblanco, 28049Madrid, Spain

Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z2 topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn0.06Sb1.22Bi0.78Te3.06 in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb)2Te4 form structures that feature three SLs, each of which is separated by two or three (Bi,Sb)2Te3 quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone.

Frolov A.S. , Usachov D.Y. , Fedorov A.V. , Vilkov O.Y. , Golyashov V. , Tereshchenko O.E. , Bogomyakov A.S. , Kokh K. , Muntwiler M. , Amati M. , Gregoratti L. , Sirotina A.P. , Abakumov A.M. , Sánchez-Barriga J. , Yashina L.V.
Ferromagnetic Layers in a Topological Insulator (Bi,Sb)2Te3 Crystal Doped with Mn
ACS Nano. 2022. V.16. N12. P.20831-20841. DOI: 10.1021/acsnano.2c08217 WOS Scopus OpenAlex

Submitted:	Aug 17, 2022
Accepted:	Nov 1, 2022
Published online:	Nov 15, 2022
Published print:	Dec 27, 2022

Web of science:	WOS:000886232500001
Scopus:	2-s2.0-85142329004
OpenAlex:	W4309070546

DB	Citing
Scopus	4
Web of science	4