Journal Article

FZJ-2020-05321

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Direct control of magnetic chirality in NdM n 2 O 5 by external electric field

Zobkalo, I. A. (First author) ; Matveeva, A. N. ; Sazonov, A. ; Barilo, S. N. ; Shiryaev, S. V. ; Pedersen, B.TUM* ; Hutanu, V. (Corresponding author)FZJ*RWTH*

2020
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/26620  doi:10.1103/PhysRevB.101.064425

Abstract: Detailed investigation of the incommensurate magnetic ordering in a single crystal of multiferroic NdMn2O5 has been performed using both nonpolarized and polarized neutron-diffraction techniques. Below TN≈30.5K magnetic Bragg reflections corresponding to the nonchiral-type magnetic structure with propagation vector k1=(0.50kz1) occurs. Below about 27 K a distorted magnetic modulation with a similar vector kz2 occurs, which is attributed to the magnetization of the Nd3+ ions by the Mn sublattice. Strong temperature hysteresis in the occurrence of the incommensurate magnetic phases in NdMn2O5 was observed depending on the cooling or heating history of the sample. Below about 20 K the magnetic structure became of a chiral type. From spherical neutron polarimetry measurements, the resulting low-temperature magnetic structure kz3 was approximated by the general elliptic helix. The parameters of the magnetic helixlike ellipticity and helical plane orientation in regard to the crystal structure were determined. A reorientation of the helix occurs at an intermediate temperature between 4 and 18 K. A difference between the population of right- and left-handed chiral domains of about 0.2 was observed in the as-grown crystal when cooling without an external electric field. The magnetic chiral ratio can be changed by the application of an external electric field of a few kV/cm, revealing strong magnetoelectric coupling. A linear dependence of the magnetic chirality on the applied electric field in NdMn2O5 was found. The results are discussed within the frame of the antisymmetric superexchange model for Dzyaloshinskii-Moriya interaction.

Keyword(s): Information and Communication (1st) ; Crystallography (2nd) ; Condensed Matter Physics (2nd) ; Magnetism (2nd) ; Instrument and Method Development (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)

Experiment(s):

1. POLI: Polarized hot neutron diffractometer (SR9a)
2. RESI: Thermal neutron single crystal diffractometer (SR8b)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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