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Helical Magnetism in Sr-Doped CaMn7O12 Films



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


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 Ca1-xSrxMn7O12 (for x up to 0.51) thin films. Consistent with bulk Ca1-xSrxMn7O^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.
Physical Review B


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


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 CaMn<sub>7</sub>O<sub>12</sub> Films, Physical Review B, [online], (Accessed April 25, 2024)
Created December 18, 2018, Updated October 12, 2021