Magnetization reversal, critical behavior, and magnetocaloric effect in NdMnO3: The role of magnetic ordering of Nd and Mn moments

Abstract

The magnetic properties, critical behavior, and magnetocaloric effect of perovskite NdMnO3 are studied. The Nd ordering is induced by the Mn ferromagnetic component with antiferromagnetic coupling with each other and then magnetization reversal occurs due to Mn moments reorientation induced by the ordering Nd moments, which explains the phenomenon of negative magnetization at low temperatures. The critical behavior of NdMnO3 is studied using Kouvel–Fisher and self-consistent methods. The results show that the Kouvel–Fisher method is reliable and critical exponents are coming out as β = 0.462 for TC = 11.15 K, γ = 1.041 for TC = 11.42 K, δ = 3.252 by critical isotherm analysis. Magnetic exchange distance may decay as [Formula: see text], that is, somewhere between the three-dimensional Heisenberg model and the mean field model. Remarkably, three temperature transitions and the corresponding three extremum values including positive and negative entropy change are observed in NdMnO3, which is different from previous reports on NdMnO3. A positive entropy change as 3.82 J/kg K at 10–15 K for μ0ΔH = 50 kOe and a negative entropy change as −0.557 J/kg K at around 8 K for μ0ΔH = 5 kOe are found, which can be put down to a fast magnetization change of NdMnO3 because of the Nd moments ordering and Mn moments reorientation. Besides, an entropy change of 1.22 J/kg K is found for μ0ΔH = 50 kOe at 80–85 K, which is corresponding to the Mn ferromagnetic ordering temperature. The relative cooling power of NdMnO3 reaches 105.9 J/kg, making it a promising candidate in the field of magnetic refrigeration.

Structural, Vibrational, and Magnetic Characterization of Orthoferrite LaFeO3 Ceramic Prepared by Reaction Flash Sintering

“…This compound exhibits a Néel temperature at 740 K [ 9 ], which is the highest in the orthoferrite family. The interesting magnetic properties of this family of compounds have led them to be proposed, very recently, as promising candidates in the field of magnetic refrigeration [ 10 ] and as potential fillers for polymer nanocomposite magnets [ 11 ].…”

Pr-Doping Effect on Spin Switching in Nd0.8Pr0.2FeO3 Single Crystal

“…When the temperature is 40 K, the slope of the curve changes in Figure (a), corresponding to the temperature compensation point ( T comp ), which may be caused by the mutual cancellation of R 3+ and Fe 3+ moments. Compared to the maximum magnetic entropy change of NdCrO 3 single crystal (−1.1 J/kg·K) and NdMnO 3 polycrystal (3.82 J/kg·K), Nd 0.8 Pr 0.2 FeO 3 single crystal is expected to be a potential candidate for new magnetic refrigeration materials. In the R FeO 3 family, the magnetocaloric effect is also an important magnetic property.…”

Ferrimagnetic Ordering and Spin-Glass State in Diluted GdFeO3-Type Perovskites (Lu0.5Mn0.5)(Mn1−xTix)O3 with x = 0.25, 0.50, and 0.75

“…ABO 3 perovskite materials usually have relatively large cations at the A site [ 1 ] with one of the smallest typical cations being Lu 3+ with ionic radius r XIII (Lu 3+ ) = 0.977 Å [ 2 ]. Perovskites containing smaller cations at the A site are sometimes called “exotic” [ 3 , 4 , 5 , 6 ], and they usually require a high-pressure, high-temperature method for their synthesis.…”