Negative magnetization in the zero field-cooled and exchange-bias effect in Cu-doped PrCrO3
Por:
Mendivil, L. F., Alvarado-Rivera, J., Tavizon, G., Verdin, E., Arenas-Alatorre, J., Duran, A.
Publicada:
1 oct 2021
Ahead of Print:
1 sep 2021
Resumen:
High-quality nanometric and homogeneous particles of Cu-doped PrCrO3
ceramic compounds were synthesized by the hydrothermal-assisted sol-gel
method. Structural, chemical state, morphology, and magnetic properties
were investigated in the PrCr1-xCuxO3 orthochromite with 0 <= x <= 0.1
composition. XRD patterns show a complete solubility of the Cu ion, as
well as an increase of the orthorhombic cell volume. The microstructural
analysis (SEM) shows that the nanometric-size particles obtained from
the synthesis process coalesce during the subsequent high-temperature
process. In addition, XPS analysis revealed that the solubility and
charge compensations by aliovalent Cu2+ ions substitution are driven by
the change of the oxidation state from Cr3+ to Cr5+ and Cr6+. These
results produce novel changes in the magnetic properties. There, the
ZFC-mode shows negative magnetization in all investigated samples, and
it is discussed as an intrinsic phenomenon in terms of the Gamma(2)
(F-x, C-y, G(z)) spin configuration as well as the arising of the
diamagnetic Cr6+ (d(o)). It is noted that Cr6+ tunes the diamagnetic
magnitude during the ZFC protocol. On the other hand, different
oxidation states are observed at the Cr site in PrCrO3, whose final
result is an increase of the coercivity field, Hc, and the remanent
magnetization, Mr, in the M-H curves. The increase of ferromagnetic and
the antiferromagnetic domains sharing the same volume leads to an
anisotropic magnetic interaction, called exchange-bias effect. It is
observed that the Cu-doped PrCrO3 decreases the exchange-bias effect,
but at the same time an increase in the magnetic properties is observed
at 2 K.
Filiaciones:
Mendivil, L. F.:
Univ Sonora, Dept Fis, Posgrad Nanotecnol, Hermosillo 83000, Sonora, Mexico
Alvarado-Rivera, J.:
Univ Sonora, Dept Fis, Conacyt, Hermosillo 83000, Sonora, Mexico
Tavizon, G.:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Fis & Quim Teor, Ciudad De Mexico 04510, Mexico
Verdin, E.:
Univ Sonora, Dept Fis, Hermosillo 83000, Sonora, Mexico
Arenas-Alatorre, J.:
Univ Nacl Autonoma Mexico, Inst Fis, Ciudad De Mexico 04510, Mexico
Duran, A.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada, Ensenada 22800, Baja California, Mexico
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