Magnetic Dispersion and Anisotropy in Multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Matsuda, M.; Fishman, Randy Scott; Hong, Tao; Lee, Chul‐Ho; Ushiyama, T.; Yanagisawa, Y.; Tomioka, Y.; Ito, T.

doi:10.1103/physrevlett.109.067205

Cited by 102 publications

(123 citation statements)

References 34 publications

(55 reference statements)

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“…The general form of the model spin Hamiltonian appropriate for BiFeO 3 was recently confirmed to be similar to those describing related structures such as REMnO 3 and α-Fe 2 O 3 [11,13,14]:…”

Section: A Atomistic Model Setupmentioning

confidence: 67%

“…The second term refers to a next-nearest-neighbor exchange between neighbors along a cubic diagonal with an antiferromagnetic coupling constant J . The third term describes a uniaxial spin anisotropy which prefers to maximize the spin component S i111 = |S ix + S iy + S iz | along the unique elongated [111] pc pseudocubic direction corresponding to the [001] direction in orthorhombic notation [13,14]. The fourth term describes the relativistic, antisymmetric superexchange of Dzyaloshinskii-Moriya form where the local DM vector governing the interaction between two spins is d ij .…”

Section: A Atomistic Model Setupmentioning

confidence: 99%

“…The final term is the Zeeman interaction describing the coupling to the externally applied field where the effective moment is g A S i μ B in a simple classical approach. The absolute values of the energy parameters (J, J , D, and κ) for BiFeO 3 were recently determined in two independent inelastic neutron scattering experiments and calculated using density functional theory (DFT) based on the local spin density approximation with an additional Hubbard energy (LSDA+U ) [11,13,14]. The results are summarized in Table II.…”

Section: A Atomistic Model Setupmentioning

confidence: 99%

“…A promising avenue of research to induce a sizable ferromagnetic component necessary for technical applications is cation substitution [5][6][7][8][9][10], which has been shown to both establish measurable weak-ferromagnetic (wFM) behavior and enhance ferroelectric properties. However, it is only comparatively recently that the mechanisms responsible for the magnetic ground state of pure BiFeO 3 have been investigated in detail, enabling a more systematic approach to improve the properties of BiFeO 3 [11][12][13][14]. The current work discusses the effect of substitutional doping in BiFeO 3 on the magnetic structure and properties through a combined experimental and calculation approach.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic exchange interactions responsible for the cycloid formation, and the precise details of its structure, have remained an open topic for research since its discovery [13,14,21]. Despite this, recent developments focusing on a full theoretical description of the magnetoelectric structure of BiFeO 3 have led to a successful model Hamiltonian, which has shown through theoretical simulations to reproduce the cycloid using effective energy parameters derived from inelastic neutron scattering and light scattering techniques [11,12,22,23].…”

Section: Introductionmentioning

confidence: 99%

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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 Atomistic Model Setupmentioning

confidence: 67%

Section: A Atomistic Model Setupmentioning

confidence: 99%

Section: A Atomistic Model Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 Experimentalist's Guide to the Cycloid, or Noncollinear Antiferromagnetism in Epitaxial BiFeO₃

et al. 2020

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Bismuth ferrite (BiFeO3) is one of the most widely studied multiferroics. The coexistence of ferroelectricity and antiferromagnetism in this compound has driven an intense search for electric‐field control of the magnetic order. Such efforts require a complete understanding of the various exchange interactions that underpin the magnetic behavior. An important characteristic of BiFeO3 is its noncollinear magnetic order; namely, a long‐period incommensurate spin cycloid. Here, the progress in understanding this fascinating aspect of BiFeO3 is reviewed, with a focus on epitaxial films. The advances made in developing the theory used to capture the complexities of the cycloid are first chronicled, followed by a description of the various experimental techniques employed to probe the magnetic order. To help the reader fully grasp the nuances associated with thin films, a detailed description of the spin cycloid in the bulk is provided. The effects of various perturbations on the cycloid are then described: magnetic and electric fields, doping, epitaxial strain, finite size effects, and temperature. To conclude, an outlook on possible device applications exploiting noncollinear magnetism in BiFeO3 films is presented. It is hoped that this work will act as a comprehensive experimentalist's guide to the spin cycloid in BiFeO3 thin films.

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Photonic‐Crafting of Non‐Volatile and Rewritable Antiferromagnetic Spin Textures with Drastic Difference in Electrical Conductivity

Kuo

Liou

et al. 2022

Advanced Materials

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Figure 3. Non-contact optical writing of the designed AFM pattern. a) Schematic of the designed pattern composed of the two distinct AFM configurations written by laser illumination. b) The XAS spectra mapping taken by measuring I A /I B , where the I A(B) is the intensity of the spectra taken at the energy A(B) for E//b as marked in Figure 3c and Figure 3d. c,d) The XAS polarization-dependent spectra for E//a and E//b taken at point 1 inside the word "BFO" (c) and at point 2 outside the word "BFO" (d)

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Magnetic Dispersion and Anisotropy in MultiferroicBiFeO3

Cited by 102 publications

References 34 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

The Experimentalist's Guide to the Cycloid, or Noncollinear Antiferromagnetism in Epitaxial BiFeO₃

Photonic‐Crafting of Non‐Volatile and Rewritable Antiferromagnetic Spin Textures with Drastic Difference in Electrical Conductivity

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Magnetic Dispersion and Anisotropy in MultiferroicBiFeO3

Cited by 102 publications

References 34 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

The Experimentalist's Guide to the Cycloid, or Noncollinear Antiferromagnetism in Epitaxial BiFeO3

Photonic‐Crafting of Non‐Volatile and Rewritable Antiferromagnetic Spin Textures with Drastic Difference in Electrical Conductivity

Contact Info

Product

Resources

About

The Experimentalist's Guide to the Cycloid, or Noncollinear Antiferromagnetism in Epitaxial BiFeO₃