abstract
Magnetic behavior of Co-II(n)Al-III layered double hydroxides (LDHs) (n = Co/Al = 2 and 3) intercalated with nitrate was studied as a function of temperature. Both LDH compounds are paramagnetic above about 8K. A rapid increase of their magnetic moments occurs below this temperature until the moments reach the maximum values at T-max of 4.0 K and 3.2 K for Co(2)Al-NO3 and Co(3)Al-NO3, respectively. Below T-max, the zero-field-cooled and the field-cooled static magnetization curves are strongly different. Along with this low-temperature phenomena, Co(2)Al-NO3 and Co(3)Al-NO3 demonstrate anomalous behavior of their temperature dependence magnetic susceptibility in a higher-temperature range: between 75 and 175 K, both the paramagnetic Curie temperature and the effective magnetic moment change in a non-monotonous way. Possible structural reasons of the observed magnetic behavior of the Co-II(n)Al-III LDHs are discussed. Published by AIP Publishing.
keywords
X-RAY-DIFFRACTION; INTERCALATION; AL
subject category
Physics
authors
Vieira, DEL; Salak, AN; Fedorchenko, AV; Pashkevich, YG; Fertman, EL; Desnenko, VA; Babkin, RY; Cizmar, E; Feher, A; Lopes, AB; Ferreira, MGS
our authors
Andrei Salak
Principal Researcher
Augusto Luís Barros Lopes
Assistant Professor
Daniel Eduardo Loureiro Vieira
PhD Student
Mário Guerreiro Silva Ferreira
Retired ProfessorGroups
G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings
acknowledgements
The work was supported by project TUMOCS. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant Agreement No. 645660. The financial supports of the Slovak Research and Development Agency under Contract Nos. APVV-14-0073 and APVV-0132-11, and the supports of P2020 COMPETE and FCT-Portugal through project POCI-01-0145-FEDER-016686-PTDC/CTM-NAN/2418/2014 (NANOCONCOR) are gratefully acknowledged as well.