Two ferromagnetic phases with different spin states of Mn and Ni inLaMn0.5Ni0.5O

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

“…Thus, the magnetic behavior of LNMO can be used to establish the Ni/Mn cation ordering in LNMO. As was found also in bulk materials 12 , the ordered phase possesses alternating Ni ) planes leading to a polar system with large dielectric constant, while such effect is absent in a disordered phase where both Ni and Mn cations are randomly distributed in the crystal structure and both cations have the 3+ oxidation states [6][7][8][9][10][11][12][13][14][15][16] . High temperature ferromagnetic transition in LNMO arises from the superexchange interaction.…”

“…They have undoubtedly revealed that the magnetic properties of LNMO are very sensitive to the local Ni/Mn cation ordering [2][3][4][6][7][8][9][10][11][12][13][14][15][16] . As shown with bulk samples, ordered LNMO should display a lone paramagnetic-to-ferromagnetic transition 2 at about 300 K while samples composed of both ordered and disordered phases should have two magnetic phase transitions 3 at ~ 150 K and ~ 300 K arising from distinct magnetic phases.…”

Phase stability and B-site ordering in La2NiMnO6 thin films

“…[1][2][3][4] The crystallographic ordering and oxidation states of the B-site cations (Ni and Mn) in LNMO related to the nature of the ferromagnetism have been extensively studied by various analytical techniques, such as nuclear magnetic resonance (NMR) spectroscopy, 5 X-ray photoelectron spectroscopy, 6 X-ray absorption spectroscopy, 7 and neutron scattering. 2,8 Mn 4þ /Ni 2þ oxidation states have been detected in the B-site ordered LNMO phase with a Curie temperature of 280 K. 4 Mn 3þ /Ni 3þ and Mn 4þ /Ni 2þ were found to coexist in the B-site disordered LNMO phase with a Curie temperature of 150 K. 9,10 In the case of a phase mixture material of B-site ordered and disordered LNMO, two Curie temperatures of 280 K and 150 K have been observed.…”

Fabrication of polycrystalline La2NiMnO6 thin films on LaAlO3 (100) substrates by chemical solution deposition

“…The magnetic transition temperature of the samples S1 and S2 are close to that of the bulk materials [4], but that of the sample S3 is much lower. It is reported that the B-site disorder and different spin states in LNMO will decrease the T c greatly [21,22]. As to our sample, the sample S3 is prepared in N 2 atmosphere, there is a lot of oxygen deficiency which will change the oxidation states of Mn and Ni ions, and Mn and Ni ions are not long-range ordered or possibly completely disordered.…”