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Lee, Hak Bong; Song, Yanmei; Chung, Jaiho; Chun, Sae Hwan; Chai, Yisheng; Kim, Kee Hoon; Reehuis, M.; Prokeš, K.; Maťaš, S.

doi:10.1103/physrevb.83.144425

Cited by 71 publications

(43 citation statements)

References 17 publications

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“…It is because the longitudinal conical spin ordering (Fig. 1b), which forms after zero-field cooling, does not exhibit any ferroelectricity 25 .…”

Section: See Methods For a Description Of The Procedures)mentioning

confidence: 98%

“…from neutron-diffraction studies 25 that the compound exhibits an incommensurate longitudinal conical ordering, in which the alternating small (S) and large (L) magnetic blocks have antiparallel c-axis components and in-plane helical ordering (Fig. 1b).…”

Section: Basicmentioning

confidence: 99%

“…Tokunaga et al 12 have demonstrated bulk magnetization reversal in Dy 0.75 Gd 0. 25 FeO 3 and Dy 0.7 Tb 0.3 FeO 3 at 2.5 K, with a maximum modulation of B ± 0.2 m B per f.u. However, full reversal could be achieved only at very low temperatures-below 3 K-because the phenomenon stems from the coupling between rare-earth and Fe moments.…”

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confidence: 95%

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Electrical control of large magnetization reversal in a helimagnet

et al. 2014

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Reversal of magnetization M by an electrical field E has been a long-sought phenomenon in materials science because of its potential for applications such as memory devices. However, the phenomenon has rarely been achieved and remains a considerable challenge. Here we report the large M reversal by E in a multiferroic Ba 0.5 Sr 1.5 Zn 2 (Fe 0.92 Al 0.08 ) 12 O 22 crystal without any external magnetic field. Upon sweeping E through the range of ±2 MVm À 1 , M varied quasi-linearly in the range of ±2 m B per f.u., resulting in the M reversal. Strong electrical modulation of M at zero magnetic field were observable up to B150 K. Nuclear magnetic resonance measurements provided microscopic evidence that the electric field and the magnetic field play equivalent roles in modulating the volume of magnetic domains. Our results suggest that the soft ferrimagnetism and the associated transverse conical state are key ingredients to achieve the large magnetization reversal at fairly high temperatures.

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“…It is because the longitudinal conical spin ordering (Fig. 1b), which forms after zero-field cooling, does not exhibit any ferroelectricity 25 .…”

Section: See Methods For a Description Of The Procedures)mentioning

confidence: 98%

Section: Basicmentioning

confidence: 99%

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Electrical control of large magnetization reversal in a helimagnet

et al. 2014

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“…The magnetic structures of BaSrCoZnFe 11 AlO 22 in the three low-field phases are still unclear. According to recent studies in several Y-type hexaferrites, the application of moderate magnetic fields induces the transverse conical spin structures and yields a finite polarization [16][17][18] . However, distinct from other Y-type hexaferrites, BaSrCoZnFe 11 AlO 22 exhibits a spontaneous polarization at zero magnetic field, which suggests that the magnetic structure in zero magnetic field is not in a perfect proper-screw or longitudinal conical configuration.…”

mentioning

confidence: 99%

“…For example, the substitution of Zn stabilizes the easy-plane anisotropy and consequently destabilizes the longitudinal conical spin structure 17 . The substitution of Al ions into octahedral Fe sites with nontrivial orbital moment can finely modify the magnetic anisotropy and thus tune the ME coupling 9,18 . The above factors are all integrated in the present compound BaSrCoZnFe 11 AlO 22 .…”

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confidence: 99%

Low magnetic field reversal of electric polarization in a Y-type hexaferrite

Fen

Zou

et al. 2012

Applied Physics Letters

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Magnetoelectric multiferroics in which ferroelectricity and magnetism coexist have attracted extensive attention because they provide great opportunities for the mutual control of electric polarization by magnetic fields and magnetization by electric fields. From a practical point view, the main challenge in this field is to find proper multiferroic materials with a high operating temperature and great magnetoelectric sensitivity. Here we report on the magnetically tunable ferroelectricity and the giant magnetoelectric sensitivity up to 250 K in a Y-type hexaferrite, BaSrCoZnFe 11 AlO 22 . Not only the magnitude but also the sign of electric polarization can be effectively controlled by applying low magnetic fields (a few hundreds of Oe) that modifies the spiral magnetic structures. The magnetically induced ferroelectricity is stabilized even in zero magnetic field. Decayless reproducible flipping of electric polarization by oscillating low magnetic fields is shown. The maximum linear magnetoelectric coefficient reaches a high value of ~ 3.0×10 3 ps/m at 200 K.In the past several years, spiral magnetic order induced multiferroics and magnetoelectric (ME) effects have been observed in a number of transition metal oxides such as TbMnO 3 , RMn 2 O 5 , CoCr 2 O 4 , and others [1][2][3] . In these spiral magnets, the magnetic order and ferroelectricity are inherently coupled and thus pronounced ME effects could be expected. 4,5 The microscopic mechanism has been well described with the spin current model 6 or the inverse Dzyaloshinskii-Moriya (DM) interaction model 7 . However, the ME effects in these spiral magnets are not useful for practical applications because they occur at low temperatures and require a large magnetic field of several tesla. Recently, the hexaferrites with helical spin order have been suggested as promising candidates for high temperature multiferroics. It was reported that some Y-type hexaferrites, such as (Ba,Sr) 2 Zn 2 Fe 12 O 22 and Ba 2 Mg 2 Fe 12 O 22 , can show magnetically induced ferroelectricity and pronounced ME effects due to modifications of spiral magnetic structures by applying magnetic fields [8][9][10][11] . Although the magnetic ordering temperatures of these Y-type hexaferrites are above room temperature, their ME effects are observable only below ~ 130 K. Subsequently, ME effects were also observed in Z-type 12,13 , M-type 14 , and U-type 15 hexaferrites.Especially, the low field ME effect in a Z-type hexaferrite, Sr 3 Co 2 Fe 24 O 41 , happens at room temperature, representing a big step towards practical applications 12. Nevertheless, there are still some critical problems to be overcome. For instance, although magnetic control of electric polarization at room temperature has been achieved, the reversal of electric polarization by magnetic fields has been realized only at low temperatures 10,11,14 . We prepared the Y-type hexaferrites by solid state reaction in oxygen. The as-sintered samples are not insulating enough at high temperatures, and thus a post-annealing...

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4D Visualization of a Nonthermal Coherent Magnon in a Laser Heated Lattice by an X‐ray Free Electron Laser

et al. 2023

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Ultrafast optical manipulation of magnetic phenomena is an exciting achievement of mankind, expanding one's horizon of knowledge toward the functional nonequilibrium states. The dynamics acting on an extremely short timescale push the detection limits that reveal fascinating light–matter interactions for nonthermal creation of effective magnetic fields. While some cases are benchmarked by emergent transient behaviors, otherwise identifying the nonthermal effects remains challenging. Here, a femtosecond time‐resolved resonant magnetic X‐ray diffraction experiment is introduced, which uses an X‐ray free‐electron laser (XFEL) to distinguish between the effective field and the photoinduced thermal effect. It is observed that a multiferroic Y‐type hexaferrite exhibits magnetic Bragg peak intensity oscillations manifesting entangled antiferromagnetic (AFM) and ferromagnetic (FM) Fourier components of a coherent AFM magnon. The magnon trajectory constructed in 3D space and time domains is decisive to evince ultrafast field formation preceding the lattice thermalization. A remarkable impact of photoexcitation across the electronic bandgap is directly unraveled, amplifying the photomagnetic coupling that is one of the highest among AFM dielectrics. Leveraging the above‐bandgap photoexcitation, this energy‐efficient optical process further suggests a novel photomagnetic control of ferroelectricity in multiferroics.

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Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba0.5Sr1.5

Cited by 71 publications

References 17 publications

Electrical control of large magnetization reversal in a helimagnet

Electrical control of large magnetization reversal in a helimagnet

Low magnetic field reversal of electric polarization in a Y-type hexaferrite

4D Visualization of a Nonthermal Coherent Magnon in a Laser Heated Lattice by an X‐ray Free Electron Laser

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