Dynamics of Domain Wall in Ferrotoroic Phase of Boracites

Sannikov, D. G.

doi:10.1080/00150190390222655

Cited by 5 publications

(4 citation statements)

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“…Ferrotoroidic domains and domain walls have been discussed by Sannikov et al [294][295][296][297]. One possible interpretation of ferrotoroidic domains is to understand the toroidal moment as an order parameter that parametrizes the degree of freedom arising from the fact that in compounds like Ni 3 B 7 O 13 I the spin component establishing the weak magnetization may be independent of the spin component forming the compensated antiferromagnetic contribution [137,298].…”

Section: Toroidal Momentsmentioning

confidence: 99%

Revival of the magnetoelectric effect

Fiebig

2005

J. Phys. D: Appl. Phys.

4,798

2,770

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Recent research activities on the linear magnetoelectric (ME) effect—induction of magnetization by an electric field or of polarization by a magnetic field—are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for ‘large’ ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90 V cm−1 Oe−1 is achieved, which exceeds the ME response of single-phase compounds by 3–5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus ‘large’ if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.

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Section: Toroidal Momentsmentioning

confidence: 99%

Revival of the magnetoelectric effect

Fiebig

2005

J. Phys. D: Appl. Phys.

4,798

2,770

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“…Ferrotoroidic domains were proposed as existing for quite a while (Schmid 2001, Sannikov 2003a, 2003b and are currently of renewed interest (Van Aken et al 2007, Ederer and Spaldin 2007, Sannikov 2007. Therefore some recent progress in their understanding will be summarized.…”

Section: Ferrotoroidic Domainsmentioning

confidence: 99%

Some symmetry aspects of ferroics and single phase multiferroics^*

Schmid

2008

J. Phys.: Condens. Matter

334

289

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The symmetry conditions for the occurrence in a same phase of one or more of the four primary ferroic properties, i.e., ferroelectricity, ferromagnetism, ferrotoroidicity and ferroelasticity, are discussed. Analogous conditions are outlined for the admission of so-called secondary and tertiary ferroic effects, such as magnetoelectric, piezoelectric, piezomagnetic, piezotoroidic, etc. Formerly postulated 'magnetotoroidic' and 'electrotoroidic' effects are found to be describable as tertiary ferroic magnetoelectric effects. For understanding ferroic and multiferroic domains and their possibilities of switching, knowledge of the pairs of prototype point group/ferroic phase point group (so-called 'Aizu species') is decisive. A classification into ensembles of species with common properties, recently extended to ferrotoroidic crystals, allows distinguishing between full, partial or no coupling between order parameters and understanding domain patterns and poling procedures. The switching by reorientation with angles other than 180 • of ferromagnetic, antiferromagnetic and ferroelectric domains by magnetic fields, electric fields or by stress requires the ferroic phase to be ferroelastic. For ferromagnetic/ferrotoroidic and antiferromagnetic/ferrotoroidic phases, the ferrotoroidic domains are found to be identical with the ferromagnetic and antiferromagnetic ones, respectively. As a consequence and depending on symmetry, ferrotoroidic domains can be switched by crossed electric and magnetic fields, by collinear electric and magnetic fields or by a magnetic field alone. Examples of ferrotoroidic domains are discussed for Fe 2−x Ga x O 3 , Co 3 B 7 O 13 Br and LiCoPO 4 . Recent new results on symmetry and domains of the antiferromagnetic incommensurate phase of BiFeO 3 are also discussed.

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“…Ferrotoroidic domains [58] and their particular walls [59] have been predicted for boracites, however, it has been shown that such domains are necessarily always (weakly) ferromagnetic or antiferromagnetic, thus a new, independent [40,47,50,53,66,67] type of domain is not created [40]. This is corroborated by the fact that when extending Aizu's concept of species of phase transitions [68] to ferrotoroidicity, the total number of species does not increase [69].…”

Section: Introductionmentioning

confidence: 95%

“…Among the 13 groups allowing both P s i and M s i , 9 allow T s i , too. Because many ferroelectric/ferromagnetic phases of boracites belong to groups permitting T s i , they are candidates of utmost interest for the study of this so far little known axiopolar vector moment in crystals [54][55][56][57][58][59]. The additional occurrence of ferroelasticity, characterized by the symmetrical second rank tensor spontaneous deformation s ik , requires a nonequiphase transition from the high-temperature prototype phase to a ferroic phase.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and structural phase transitions of multiferroic boracitesM3B7O13X(M=

Schnelle

Schmid

2015

Phys. Rev. B

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The specific heat capacity of mostly single-crystalline samples of 21 boracite compounds M 3 B 7 O 13 X with M a 3d transition metal (Cr, Mn, Fe, Co, Ni, Cu, Zn) or Mg and X a halogen (Cl, Br, I) is determined. In combination with magnetic susceptibility data the magnetic ordering of the M 2+ ions at T N is investigated in detail. The fully ferroelectric/fully ferroelastic structural phase transitions at higher temperatures are measured by differential scanning calorimetry. In the Cr-Br, Cr-I, Cu-Cl, and Cu-Br compounds, previously unknown magnetic phases were found. Magnetic order in the boracites is characterized by the quantum and classical spin states of the M 2+ ions, a variable degree of structural distortion, orbital effects, and competing exchange interactions. The Cu-Cl, Cu-Br, and Ni-Cl boracites exhibit broad maxima of magnetic specific heat and of magnetic susceptibility above T N caused by low-dimensional or frustrated magnetic interactions. Co boracites display additional broad anomalies below T N originating from continuous spin reorientations and effective S = 1/2 ground states. Indications for spin reorientations are also observed for Fe boracites. New phases appear in high magnetic fields for some Co and Fe boracites, which is not the case for the Mn compounds. Stronger magnetic frustration is deduced for the cubic Cr compounds. For the latter compounds and Ni-I boracite magnetostructural phase transitions are observed.

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Dynamics of Domain Wall in Ferrotoroic Phase of Boracites

Cited by 5 publications

References 0 publications

Revival of the magnetoelectric effect

Revival of the magnetoelectric effect

Some symmetry aspects of ferroics and single phase multiferroics^*

Magnetic and structural phase transitions of multiferroic boracitesM3B7O13X(M=

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Dynamics of Domain Wall in Ferrotoroic Phase of Boracites

Cited by 5 publications

References 0 publications

Revival of the magnetoelectric effect

Revival of the magnetoelectric effect

Some symmetry aspects of ferroics and single phase multiferroics*

Magnetic and structural phase transitions of multiferroic boracitesM3B7O13X(M=

Contact Info

Product

Resources

About

Some symmetry aspects of ferroics and single phase multiferroics^*