Helical Magnetism in Sr-Doped CaMn7O12 Films

Published

December 19, 2018

Author(s)

Amanda Huon, Anuradha M. Vibhakar, Alexander Grutter, Julie Borchers, Steven Disseler, Yaohua Liu, Wei Tian, Fabio Orlandi, Pascal Manuel, Dmitry D. Khalyavin, Yogesh Sharma, Andreas Herklotz, Ho Nyung Lee, Michael R. Fitzsimmons, Roger D. Johnson, Steven J. May

Abstract

Noncollinear magnetism can play an important role in multiferroic materials but is relatively understudied in oxide heterostructures compared to their bulk counterparts. Using magnetometry and neutron diffraction, we demonstrate the presence of helical magnetic ordering in CaMn₇O₁₂ and Ca_1-xSr_xMn₇O₁₂ (for x up to 0.51) thin films. Consistent with bulk Ca_1-xSr_xMn₇O^d12, the net magnetization increases with Sr doping. Neutron diffraction confirms that the helical magnetic structure remains incommensurate at all values of x, while the fundamental magnetic wavevector increases upon Sr substitution. This result demonstrates a chemical-based approach for tuning helical magnetism in quadruple perovskite films and enables future studies of strain and interfacial effects on helimagnetism in oxide heterostructures.

Citation

Physical Review B

Volume

98

Issue

22

Pub Type

Journals

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Keywords

Neutron diffraction, Helical magnetic order, Magnetic transitions, Magnetic oxide, Polarized neutron beam, Thin Film

Citation

Huon, A. , Vibhakar, A. , Grutter, A. , Borchers, J. , Disseler, S. , Liu, Y. , Tian, W. , Orlandi, F. , Manuel, P. , Khalyavin, D. , Sharma, Y. , Herklotz, A. , Lee, H. , Fitzsimmons, M. , Johnson, R. and May, S. (2018), Helical Magnetism in Sr-Doped CaMn₇O₁₂ Films, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926693 (Accessed October 13, 2025)