Multiferroism in orientational engineered (La, Mn) co-substituted BiFeO3 thin films

Wang, D. Y.; Chan, Ngai Yui; Zheng, Rongkun; Kong, Charlie; Lin, Dunmin; Chan, H.L.W.; Li, S.

doi:10.1063/1.3594745

Cited by 35 publications

(16 citation statements)

References 38 publications

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“…Importantly, the wFM canting angle is thought to be linearly related to the rotation angles in both P nma and R3c space groups up to ∼11 • [11]. In the present case, given the very similar rotational angle, it is unlikely that the increased wFM moment arises from an increased octahedral rotation, as reported in previous studies of doped BiFeO 3 compounds [7,33]. Instead, the increase in wFM from expected latent values of pure BiFeO 3 are likely to arise from modifications to the relative strength of competing DM interactions and anisotropy compared to the antiferromagnetic superexchange.…”

Section: A Room-temperature Structuresupporting

confidence: 58%

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

et al. 2014

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Powder neutron diffraction and magnetometry studies have been conducted to investigate the crystallographic and magnetic structure of Bi0.8La0.2Fe0.5Mn0. 5O3. The compound stabilizes in the Imma orthorhombic crystal symmetry in the measured temperature range of 5 to 380 K, with a transition to antiferromagnetic order at TN≈240 K. The spin cycloid present for BiFeO3 is found to be absent with 50% Mn3+ cation substitution, leading to G-type antiferromagnetic order with an enhanced out-of-plane canted ferromagnetic component, evident from measurable weak-ferromagnetic hysteresis. Structural modifications do not solely explain this behavior, indicating that modified electron exchange interactions must be taken into account. A classical spin simulation was developed to investigate the effect of random substitution in a disordered pseudocubic perovskite. The calculations took into account the nearest-neighbor, next-nearestneighbor, and Dzyaloshinskii-Moriya interactions, along with the local spin anisotropy. Using this framework to extend the established Hamiltonian model for BiFeO3, we show that only certain types of perturbations at a magnetic defect and the surrounding molecular fields trigger a simultaneous collapse of cycloidal order and the emergence of the long-range weak-ferromagnetic component. By adopting values for the Mn molecular fields appropriate for REMnO3 (RE= rare earth), simulations of BiMn0.5Fe0.5O3 exhibit the key magnetic properties of our experimental observations. Powder neutron diffraction and magnetometry studies have been conducted to investigate the crystallographic and magnetic structure of Bi 0.8 La 0.2 Fe 0.5 Mn 0.5 O 3 . The compound stabilizes in the I mma orthorhombic crystal symmetry in the measured temperature range of 5 to 380 K, with a transition to antiferromagnetic order at T N ≈ 240 K. The spin cycloid present for BiFeO 3 is found to be absent with 50% Mn 3+ cation substitution, leading to G-type antiferromagnetic order with an enhanced out-of-plane canted ferromagnetic component, evident from measurable weak-ferromagnetic hysteresis. Structural modifications do not solely explain this behavior, indicating that modified electron exchange interactions must be taken into account. A classical spin simulation was developed to investigate the effect of random substitution in a disordered pseudocubic perovskite. The calculations took into account the nearest-neighbor, next-nearest-neighbor, and Dzyaloshinskii-Moriya interactions, along with the local spin anisotropy. Using this framework to extend the established Hamiltonian model for BiFeO 3 , we show that only certain types of perturbations at a magnetic defect and the surrounding molecular fields trigger a simultaneous collapse of cycloidal order and the emergence of the long-range weak-ferromagnetic component. By adopting values for the Mn molecular fields appropriate for REMnO 3 (RE = rare earth), simulations of BiMn 0.5 Fe 0.5 O 3 exhibit the key magnetic properties of our experimental observations.

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Section: A Room-temperature Structuresupporting

confidence: 58%

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

et al. 2014

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“…The highest moment values achieved were for TM = Co, where 6 emu/cc was obtained at 10 K . As far as Mn doping of the B ‐site goes, even though the theoretical predictions of Pálová et al suggested that it may be possible to achieve co‐existent FM and FE, in both bulk and thin films over a wide doping range only low moments have been observed . However, in these earlier studies relatively thick films (>100 nm) were studied which were not highly strained …”

Section: Introductionmentioning

confidence: 96%

Room Temperature Ferrimagnetism and Ferroelectricity in Strained, Thin Films of BiFe_0.5Mn_0.5O₃

Choi

Fix

Kuršumović

et al. 2014

Adv Funct Materials

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Highly strained films of BiFe0.5Mn0.5O3 (BFMO) grown at very low rates by pulsed laser deposition were demonstrated to exhibit both ferrimagnetism and ferroelectricity at room temperature and above. Magnetisation measurements demonstrated ferrimagnetism (TC ∼ 600K), with a room temperature saturation moment (MS) of up to 90 emu/cc (∼ 0.58 μB/f.u) on high quality (001) SrTiO3. X-ray magnetic circular dichroism showed that the ferrimagnetism arose from antiferromagnetically coupled Fe3+ and Mn3+. While scanning transmission electron microscope studies showed there was no long range ordering of Fe and Mn, the magnetic properties were found to be strongly dependent on the strain state in the films. The magnetism is explained to arise from one of three possible mechanisms with Bi polarization playing a key role. A signature of room temperature ferroelectricity in the films was measured by piezoresponse force microscopy and was confirmed using angular dark field scanning transmission electron microscopy. The demonstration of strain induced, high temperature multiferroism is a promising development for future spintronic and memory applications at room temperature and above.

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“…However, pure BiFeO 3 has a low magnetic moment in bulk and thin film form, 2,5 owing to the formation of an incommensurate spin cycloid that minimizes coherent spin canting (weak ferromagnetism). 9,10 To date, BiMnO 3 is the only material where the coexistence of true ferromagnetic and ferroelectric order has been reported, 5,7,11,12 albeit with a low magnetic ordering temperature (%100 K). To complicate matters, it appears that ferromagnetic and antiferromagnetic exchange interactions compete in BiMnO 3 , and the resulting ground state depends on applied pressure.…”

mentioning

confidence: 99%

The magnetic structure of an epitaxial BiMn0.5Fe0.5O3 thin film on SrTiO3 (001) studied with neutron diffraction

Cortie

Stampfl

Klose

et al. 2012

Applied Physics Letters

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High-angle neutron diffraction was used to directly reveal the atomic-scale magnetic structure of a single-crystalline BiMn0.5Fe0.5O3 thin film deposited on a SrTiO3 (001) substrate. The BiMn0.5Fe0.5O3 phase exhibits distinctive magnetic properties that differentiate it from both parent compounds: BiFeO3 and BiMnO3. A transition to long-range G-type antiferromagnetism was observed below 120 K with a (121212) propagation vector. A weak ferromagnetic behavior was measured at low temperature by superconducting quantum interference device (SQUID) magnetometry. There is no indication of the spin cycloid, known for BiFeO3, in the BiMn0.5Fe0.5O3 thin film. The neutron diffraction suggests a random distribution of Mn and Fe over perovskite B sites.

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Multiferroism in orientational engineered (La, Mn) co-substituted BiFeO3 thin films

Cited by 35 publications

References 38 publications

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

Room Temperature Ferrimagnetism and Ferroelectricity in Strained, Thin Films of BiFe_0.5Mn_0.5O₃

The magnetic structure of an epitaxial BiMn0.5Fe0.5O3 thin film on SrTiO3 (001) studied with neutron diffraction

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Multiferroism in orientational engineered (La, Mn) co-substituted BiFeO3 thin films

Cited by 35 publications

References 38 publications

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskiteBi0.8La0.2Fe0.5Mn0.5O

Room Temperature Ferrimagnetism and Ferroelectricity in Strained, Thin Films of BiFe0.5Mn0.5O3

The magnetic structure of an epitaxial BiMn0.5Fe0.5O3 thin film on SrTiO3 (001) studied with neutron diffraction

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Room Temperature Ferrimagnetism and Ferroelectricity in Strained, Thin Films of BiFe_0.5Mn_0.5O₃