Antiferromagnetic structure of LaFeO3 from high resolution tof neutron diffraction

Peterlin-Neumaier, T.; Steichele, E.

doi:10.1016/0304-8853(86)90431-2

Cited by 51 publications

(30 citation statements)

References 11 publications

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“…It is clear that if we introduce the strong Heisenberg exchange (J ∼ 6 meV) that has the tendency to align the spins antiparallel, then the intersection of the easy planes will determine the spin direction as reported previously for P nma perovskites 30,31 . However, while it has been shown from symmetry arguments by Bertaut 12 that the SIA allows a canting of the spins in this system, here we prove that the combination of all the SIAs compensate in such a way that they do not give rise to a canting of the spins.…”

Section: A Cubic Perovskitementioning

confidence: 67%

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

2012

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The link between the crystal distortions of the perovskite structure and the magnetic exchange interaction, the single-ion anisotropy (SIA) and the Dzyaloshinsky-Moriya (DM) interaction are investigated by means of density-functional calculations. Using BiFeO3 and LaFeO3 as model systems, we quantify the relationship between the oxygen octahedra rotations, the ferroelectricity and the weak ferromagnetism (wFM). We recover the fact that the wFM is due to the DM interaction induced by the oxygen octahedra rotations. We find a simple relationship between the wFM, the oxygen rotation amplitude and the ratio between the DM vector and the exchange parameter such as the wFM increases with the oxygen octahedra rotation when the SIA does not compete with the DM forces induced on the spins. Unexpectedly, we also find that, in spite of the d 5 electronic configuration of Fe 3+ , the SIA is very large in some structures and is surprisingly strongly sensitive to the chemistry of the A-site cation of the ABO3 perovskite. In the ground R3c state phase we show that the SIA shape induced by the ferroelectricity and the oxygen octahedra rotations are in competition such as it is possible to tune the wFM "on" and "off" through the relative size of the two types of distortion.

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Section: A Cubic Perovskitementioning

confidence: 67%

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

2012

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“…The magnetic structure of the as-prepared sample is similar to the G-type antiferromagnetic one observed in LaFeO 3 [17]. The magnetic moment, about 2.28µ B per B perovskite ion, was calculated using low-temperature NPD data.…”

Section: Resultsmentioning

confidence: 98%

Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d

Karpinsky¹,

Troyanchuk

Kopcewicz

2007

Physica Status Solidi (b)

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PACS 61.12. Ld, 72.80.Ga, 76.80.+ y Mössbauer, neutron powder diffraction and magnetization measurements have been performed for the LaCo 0.42 Fe 0.58 O 3-d compounds in the temperature range 4.2 K < T < 400 K. It was found that a stoichiometric compound has a canted G-type antiferromagnetic structure with T N ~ 380 K and magnetic moment of 2.3µ B per formula unit. Combined Mössbauer and neutron-diffraction data give evidence that only Fe 3+ ions are in the magnetically ordered state, whereas Co 3+ ones are in the nonmagnetic low-spin state and do not participate actively in the magnetic interactions. The oxygen loss leads to the reduction of Co ions down to the 2 + valence state keeping Fe ions in the 3 + valence state. At the same time the T N temperature increases and the weak ferromagnetic component is suppressed. Newly generated strong antiferromagnetic interactions Co 2+-O-Fe 3+ arise.

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“…We note the appearance of a spontaneous magnetization and a hysteresis loop at room temperature. LaFeO 3 is an orthoferrite with a G-type spin ordered antiferro- magnetic structure [11]. The shape of the hysteresis loop is characteristic of weak ferromagnetism.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Magnetic Properties of La1?xSrxFeO3 Nanoparticles

Kou

Qin

et al. 2002

phys. stat. sol. (a)

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Subject classification: 61.46.+w; 75.50.Tt; 75.75.+a; S10.15 Perovskite-type complex ferrite La 1--x Sr x FeO 3 (x ¼ 0-0.3) nanoparticles of different particle sizes were prepared using the sol-gel method. The influence of the Sr content and particle size on the microstructure and magnetic properties has been investigated. Increasing Sr content and increasing particle size lead to lattice contractions. Magnetic measurements indicate the existence of a weak ferromagnetism in La 1--x Sr x FeO 3 nanoparticles. The spontaneous magnetization of the weak ferromagnetism decreases with increasing Sr content and increasing particle size. The influence of microstructure on the magnetic properties has been discussed.

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Antiferromagnetic structure of LaFeO3 from high resolution tof neutron diffraction

Cited by 51 publications

References 11 publications

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d

Microstructure and Magnetic Properties of La1?xSrxFeO3 Nanoparticles

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Antiferromagnetic structure of LaFeO3 from high resolution tof neutron diffraction

Cited by 51 publications

References 11 publications

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Mössbauer and neutron‐diffraction studies of LaCo0.42Fe0.58O3–d

Microstructure and Magnetic Properties of La1?xSrxFeO3 Nanoparticles

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Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d