Magnetic model in multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">NdFe</mml:mi><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub><mml:mo>(</mml:mo><mml:mi mathvariant="normal">BO</mml:mi><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>investigated by inelastic neutron scattering

Hayashida, Shohei; Soda, Minoru; Itoh, Shinichi; Yokoo, Tetsuya; Ohgushi, Kenya; Kawana, Daichi; Rønnow, Henrik M.; Masuda, Takatsugu

doi:10.1103/physrevb.92.054402

Cited by 24 publications

(8 citation statements)

References 37 publications

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“…a modification of the spin wave spectra. Actually, the exchange J 6 should, in principle, hybridize the crystal field and spin wave responses, as for instance proposed in other materials like ErMnO 3 6 or NdFe 3 (BO 3 ) 4 3 . This hybridization may be the physical origin of the peculiar spectrum observed in Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Particularly, the issue of determining the actual role of spin in the emergence of ferroelectric state has been a very crucial topic of research in recent years. Different mechanisms have been proposed, like the inverse Dzyaloshinskii - Moriya ( DM ) interaction model 2 , the exchange - striction mechanism 1 and the spin dependent metal - ligand hybridization model 3–6 among others, but no universal model could be implemented to the entire family. It remains that the magnetic properties of many of such magnetic ferroelectrics are driven by 4 f rare earths and 3 d transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

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3d-4f coupling and multiferroicity in frustrated Cairo Pentagonal oxide DyMn2O5

Chattopadhyay

Petit

Ressouche

et al. 2017

Sci Rep

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In solid state science, multifunctional materials and especially multiferroics have attracted a great deal of attention, as they open the possibility for next generation spintronic and data storage devices. Interestingly, while many of them host coexisting 3d and 4f elements, the role of the coupling between these two magnetic entities has remained elusive. By means of single crystal neutron diffraction and inelastic neutron scattering experiments we shed light on this issue in the particular case of the multiferroic oxide DyMn2O5. This compound undergoes a first order magnetic transition from a high temperature incommensurate phase to a low temperature commensurate one. Our investigation reveals that although these two phases have very different magnetic structures, the spin excitations are quite similar indicating a fragile low temperature ground state with respect to the high temperature one. Such a rare scenario is argued to be a manifestation of the competition between the exchange interaction and 4f magnetic anisotropy present in the system. It is concluded that the magnetic structure, hence the ferroelectricity, can be finely tuned depending on the anisotropy of the rare earth.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

3d-4f coupling and multiferroicity in frustrated Cairo Pentagonal oxide DyMn2O5

Chattopadhyay

Petit

Ressouche

et al. 2017

Sci Rep

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“…A few decades ago Yamaguchi proposed and analyzed a model, which took into account all symmetric and antisymmetric exchange interactions within the Fe sublattice as well as interactions between Fe and R sublattices, whereas the interactions and anisotropy within the R sublattice were neglected [38]. The excitation spectrum of this model consists of a number of entangled collective Fe-R spinwave modes, as was shown for many other compounds with magnetic interaction between different sublattices [40][41][42][43][44][45].…”

Section: A Magnetic Hamiltonian Of Ybfeomentioning

confidence: 99%

Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3 : Evolution of magnetic excitations through the spin-reorientation transition

Nikitin

Sefat

et al. 2018

Phys. Rev. B

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In this paper we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO 3 at temperatures below and above the spin-reorientation (SR) transition T SR = 7.6 K, in magnetic fields applied along the a, b and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ∼60 meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ∼1 meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at T SR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinon-like fluctuations. At T < T SR , the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at T > T SR only a gapped broad spinon-like continuum dominates the spectrum. In this work we show that a weak quasi-1D coupling within the Yb subsystem J Yb-Yb , mainly neglected in previous studies, creates unusual quantum spin dynamics on the low energy scales. The results of our work may stimulate further experimental search for similar compounds with several magnetic subsystems and energy scales, where low-energy fluctuations and underlying physics could be "hidden" by a dominating interaction. entropy evolution [9], laser-pulse induced ultrafast spinreorientation [10-12] etc. Magnetic property investigations of the rare-earth orthoferrites RFeO 3 have shown that the Fe 3+ moments (S = 5 2 ) are ordered in a canted AFM structure Γ 4 at high temperature with T N ≈ 600 K (details of the notations are given in [13]), and the spin canting gives a weak net ferromagnetic moment along the c axis [ Fig. 1(c)] [13][14][15]. Furthermore, symmetry analysis and careful neutron diffraction measurements have found a second "hidden" canting along the b-axis, which is symmetric relative to the ac-plane and does not create a net moment [16,17]. With decreasing temperature, a spontaneous spin-reorientation (SR) transition from Γ 4 to the Γ 2 magnetic configuration occurs in many orthoferrites with magnetic R-ions [13,14] in a wide temperature range from T SR ≈ 450 K for SmFeO 3 down to T SR ≈ 7.6 K for YbFeO 3 , and the net magnetic moment rotates from the a to the c axis [see Fig. 1(c-e)]. Most of previous work that was devoted to the investigation of the SR transition in RFeO 3 , associated this phenomenon with the R-Fe exchange interaction, because orthoferrites with nonmagnetic R =La, Y or Lu preserve the Γ 4 magnetic structure down to the lowest temperatures.Taking into account three characteristic t...

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“…Furthermore, we have successfully investigated spin dynamics in condensed matter with a conventional manner of INS and obtained the following results [11][12][13][14][15].…”

Section: Results From Further Studiesmentioning

confidence: 99%