Magnons in the Multiferroic Phase of Cupric Oxide

Maity, Avishek; Schwesig, Steffen; Ziegler, Fabian; Sobolev, Oleg; Eckold, G.

doi:10.1002/pssb.201900704

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…Earlier, Kimura et al have achieved the induced multiferroic behavior in CuO near to room temperature and also observed the memory effect in CuO [11,12]. Copper oxide (CuO) is a type-II multiferroics, which possess ferroelectric transition of T C at 230 K and three consecutive antiferromagnetic transitions of T N1 at 213 K, T N2 at 229.2 K and T N3 at 229.8 K [13]. Moreover, CuO is widely studied for its potential applications in electromagnetic based refrigerator, diluted magnetic semiconductors and high temperature superconductors [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

Elayaperumal

Malathi

Murugesan

et al. 2020

J Mater Sci: Mater Electron

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Room temperature multiferroicity was achieved in CuO-doped Sr 3 Bi 4 Ti 6 O 21 (SBT 6 ) lead-free bismuth layered structure ferroelectric ceramics. On addition of CuO, a feeble magnetization with highest saturation magnetization of * 3 memu/g and least coercivity of 676 Oe was obtained for x = 0.5 mol% sample. The effect of magnetic field on the ferroelectric properties was investigated, which reveals the presence of magnetoelectric (ME) coupling indirectly and the maximum remnant polarization of 12.16 lC/cm 2 at 1 kOe was obtained. Moreover, from direct measurements (ME studies), coupling between ferromagnetic and ferroelectric phases was also achieved at room temperature. Further, the presence of feeble ME effect decreases upon increasing CuO doping concentration, especially at higher doping concentration. The induced spontaneous magnetization, oxygen vacancies and strong magnetic superexchange interaction of CuO played a key role in achieving room temperature multiferroicity.

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Section: Introductionmentioning

confidence: 99%

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

Elayaperumal

Malathi

Murugesan

et al. 2020

J Mater Sci: Mater Electron

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show abstract

“…In such materials 8 – 11 the retardation effects are relatively large and cannot be ignored. There, the polarization, , of a ferroelectric manifests retarded response to the electric filed , hence , where is the polarizability tensor 12 , 13 in a linear response approximation. The superexchange interaction of magnetic moments in granular multiferroics 14 , where electric and magnetic degrees of freedom mutually influence each other, acquires retardation as well.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent exchange creates the time-frustrated state of matter

Valiulin

Chtchelkatchev

Mikheyenkov

et al. 2022

Sci Rep

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Magnetic systems governed by exchange interactions between magnetic moments harbor frustration that leads to ground state degeneracy and results in the new topological state often referred to as a frustrated state of matter (FSM). The frustration in the commonly discussed magnetic systems has a spatial origin. Here we demonstrate that an array of nanomagnets coupled by the real retarded exchange interactions develops a new state of matter, time frustrated matter (TFM). In a spin system with the time-dependent retarded exchange interaction, a single spin-flip influences other spins not instantly but after some delay. This implies that the sign of the exchange interaction changes, leading to either ferro- or antiferromagnetic interaction, depends on time. As a result, the system’s temporal evolution is essentially non-Markovian. The emerging competition between different magnetic orders leads to a new kind of time-core frustration. To establish this paradigmatic shift, we focus on the exemplary system, a granular multiferroic, where the exchange transferring medium has a pronounced frequency dispersion and hence develops the TFM.

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“…In such materials [8][9][10][11] the retardation effects are relatively large and cannot be ignored. There, the polarization, P, of a ferroelectric manifests retarded response to the electric filed E, hence P(t) = α(t−t )E(t )dt , where α is the polarizability tensor 12,13 in a linear response approximation. The superexchange interaction of magnetic moments in granular multiferroics 14 , where electric and magnetic degrees of freedom mutually influence each other, acquires retardation as well.…”

mentioning

confidence: 99%

Time-dependent exchange creates the time-frustrated state of matter

Valiulin,

Chtchelkatchev,

Mikheyenkov

et al. 2022

Preprint

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Magnetic systems governed by exchange interactions between magnetic moments harbor frustration that leads to ground state degeneracy and results in the new topological state often referred to as a frustrated state of matter (FSM). The frustration in the commonly discussed magnetic systems has a spatial origin. Here we demonstrate that an array of nanomagnets coupled by the real retarded exchange interactions develops a new state of matter, time frustrated matter (TFM). In a spin system with the time-dependent retarded exchange interaction, a single spin-flip influences other spins not instantly but after some delay. This implies that the sign of the exchange interaction changes, leading to either ferro-or antiferromagnetic interaction, depends on time. As a result, the system's temporal evolution is essentially non-Markovian. The emerging competition between different magnetic orders leads to a new kind of time-core frustration. To establish this paradigmatic shift, we focus on the exemplary system, a granular multiferroic, where the exchange transferring medium has a pronounced frequency dispersion and hence develops the TFM.

show abstract

Magnons in the Multiferroic Phase of Cupric Oxide

Cited by 4 publications

References 33 publications

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

Time-dependent exchange creates the time-frustrated state of matter

Time-dependent exchange creates the time-frustrated state of matter

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