期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 103, 期 -, 页码 354-360出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2018.06.027
关键词
Extended Bloch's law; Doped YIG; Sol-gel; Atomic disordering
资金
- Brazilian Agency: Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Brazilian Agency: Conselho Nacional de Desenvolvimento Cientifco e Tecnologico (CNPq)
- Brazilian Agency: Financiadora de Estudos e Projetos (FINEP)
- Brazilian Agency: Fundacao de Amparo a Ciencia e Tecnologia de Pernambuco (FACEPE)
The empirical extended Bloch's law about the saturation magnetization behavior as a function of temperature was checked in nanoparticles of yttrium iron garnet doped with zinc, nickel and cobalt. The exponent values from fitting extended Bloch's law with experimental results vary from 1.42 to 9.68, and are different from these expected values; 9/2, 2, 3/2, 3 and 5/2. The discrepancy was associated to the existence of structural defects and moments with frustrated exchange interaction, due to the nanoparticles size and thermal treatment conditions. Other adjustment attempt was performed with a linear term combined to the traditional Bloch's law T-3/2 motivated by the nanometric particles size. This other attempt was unsuccessful showing discrepancy with the experimental results and attributed to the atomic disorder and magnetic frustrations.
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