Exchange-bias-like effect in Pr0.75Tb0.25Al2 and Pr0.7Tb0.3Al2 samples

Tedesco, J.C.G.; Pires, M. J. M.; Carvalho, A. Magnus G.; Sousa, V.S.R. de; Cardoso, Lisandro Pavie; Coelho, A. A.

doi:10.1016/j.jmmm.2013.02.049

Cited by 8 publications

(15 citation statements)

References 26 publications

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“…The M versus T data for x = 0.25 clearly present a ferrimagnetic behavior, with a field cooling magnetization curve showing a maximum value followed by a significant reduction as the temperature is lowered below the magnetic ordering temperature. Moreover, below T comp = 25 K, the M versus T plot shows negative values, observed even at the highest field [4,15,16,26]. As previously discussed [15], this occurs because a strong axial anisotropy is present at lower temperatures as well as differing variations of the magnetic amplitudes of the two sublattices as a function of temperature.…”

Section: Theoretical Approachmentioning

confidence: 51%

“…(l Pr = 3.2 l B ) [13,14], and assuming an AF coupling, we find that the appearance of the compensation points is favored for x = 0.26. Indeed, compensation temperatures (T comp ) were observed below the ferrimagnetic ordering temperature for x = 0.25 and 0.30 at 25 and 40 K, respectively [15]. Also, when the competition between the magnetic sublattices is enhanced, interesting effects such as zero net magnetization even in the ordered phases can occur, and properties related to the magnetic polarization of the rare earth conduction electrons are observed [4,5,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, compensation temperatures (T comp ) were observed below the ferrimagnetic ordering temperature for x = 0.25 and 0.30 at 25 and 40 K, respectively [15]. Also, when the competition between the magnetic sublattices is enhanced, interesting effects such as zero net magnetization even in the ordered phases can occur, and properties related to the magnetic polarization of the rare earth conduction electrons are observed [4,5,15,16]. In this sense, the Pauli paramagnetism contribution from the conduction electrons is already relatively important in comparison to the contribution from the ionic spins to the total magnetization [15].…”

Section: Introductionmentioning

confidence: 99%

“…Also, when the competition between the magnetic sublattices is enhanced, interesting effects such as zero net magnetization even in the ordered phases can occur, and properties related to the magnetic polarization of the rare earth conduction electrons are observed [4,5,15,16]. In this sense, the Pauli paramagnetism contribution from the conduction electrons is already relatively important in comparison to the contribution from the ionic spins to the total magnetization [15]. Furthermore, the magnetic polarization of the conduction electrons becomes important at lower temperatures, as observed for Kondo materials [17,18], with the induced unidirectional anisotropy becoming stronger [4,5,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, the Pauli paramagnetism contribution from the conduction electrons is already relatively important in comparison to the contribution from the ionic spins to the total magnetization [15]. Furthermore, the magnetic polarization of the conduction electrons becomes important at lower temperatures, as observed for Kondo materials [17,18], with the induced unidirectional anisotropy becoming stronger [4,5,15,16]. Finally, the EB-like effect was reported for Tb x Pr 1-x Al 2 with x = 0.25 and 0.30 [15] below 12 and 20 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering

et al. 2015

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Neutron powder diffraction and inelastic neutron scattering data were used to simulate and understand the magnetization and heat capacity curves of the pseudobinary Tb x Pr 1-x Al 2 , with x = 0.10 and 0.25, as a function of temperature. From the Rietveld analysis, we concluded that no crystallographic transition occurs in these samples, and the high symmetry of the magnetic structure was confirmed. Moreover, the different contributions from the reflection planes could be related to the known exchange bias-like effect characteristic for the x = 0.25 sample, also suggesting the existence of some rearrangement of the magnetic moments or even the presence of spin frustration in this system. Finally, the obtained set of theoretical parameters using the mean field approach for the two systems consisting of two sublattices allowed the experimental data to be described and to explain their physical behaviors. The ensemble of our results leads us to affirm that the quadrupolar interactions as well as an existence of some rearrangement of the magnetic moments or a frustration play an important role in the strong unidirectional anisotropy and the exchange bias-like effect observed in this pseudobinary system.

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