Polarization-optical observation of ferroelastic domains in the incommensurate phase of BaMnF<sub>4</sub>

Sciau, Ph.; Rivera, Jean-Pierre; Schmid, Hans

doi:10.1080/00150198908018102

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…This is in accord with dielectric data (Fox et al 1980) that show an a-axis anomaly near T N = 29 K in the Mn compound but not in the Co or Mn(1 − x)Co(x) compounds. However, Sciau et al (1989) were able to measure a higher-order magnetoelectric term in P M 2 but not a bilinear magnetoelectric coefficient, perhaps due to twinning (Scott and Tilley). Fox et al were the first to point out the essential P • (L × M) term in the free energy for such a magnetoelectric and to explain how this caused spin canting; and they also were the first to analyze the frequency dependences of electric responses.…”

Section: Reviewsmentioning

confidence: 99%

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Scott

Blinc

2011

J. Phys.: Condens. Matter

109

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Section: Reviewsmentioning

confidence: 99%

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Scott

Blinc

2011

J. Phys.: Condens. Matter

109

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Polarized Light Microscopy (PLM) of Ferroelectric and Ferroelastic Domains in Transmitted and Reflected Light

Schmid

1993

Ferroelectric Ceramics

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The importance of polarized light microscopy (PLM) for the study of the domains and phase transitions of fe rroelectric a nd ferroelastic single crystals is pin-pointed and the e xperimental set-ups for observations and me as ure ments between 4 and 1600K are outlined. The contrast formation between domains by spontaneous birefringence and reciprocal rotatory power in transmission. and by bireOectance. specular reflection and e tchin g in re flec ted light are co ns ide re d. A s ymme try classificati o n for th e birefringe nce and rotatory power contras t formation is proposed. The use of PLM for ceramic materials e ncounters difficulties, whic h can be overcome hy e nhancing grain g rowth and re ducing sources o f light scattering. So me e xamples are give n, demonstratin g the great powe r of PLM , if used in conjunction with other physical measurements. ~'"""1 IntroductionFerroe lectrics and other materials with phase transiti ons split up into "domains" (Brezina et al. , 1989) upon passage to the low s ymmetry phase. The ir identificati on and the s tudy of their optical properties by polarized light mic rosc opy (PLM) is the main subject o f this contribution. The resolution o f a light microscope is in the mos t favourable case of the order of half a wavelength of light, whe re as with a high resolution e lectron microscope o ne c an see ranges of atom s, incommensurabilities and many mo re Enc de tail, including do mains and domain wa lls.Info rm ati on on the bulk and anisotropy properties may, however, getlosL Fortunately there exists a resolution ran ge, spanning from about half a microme ter to the resolution of the bare human eye (about l OO~m ) , which is most brilliantly covered for anisotropic crystals by the polarizing li ght microscope, permitting great pene tration depths in the trans mission regi me, unequaled in e lectron mic roscopy. For PLM s tudies the availability o f single crystals is o f utmos t importance.

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Symmetry and magnetoelectric interactions in BaMnF4

Zvezdin

Pyatakov

2010

Low Temperature Physics

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Symmetry analysis is used to study magnetic anisotropy and magnetoelectric interactions in the ferroelectric antiferromagnet BaMnF4 theoretically. It is shown that symmetry admits the existence in this material of a nonuniform magnetoelectric interaction (flexomagnetoelectric type) with a specific dependence on the magnitude and orientation of the external magnetic field. With increasing magnetic field this interaction can cause a phase transition into a magnetic incommensurate phase with a characteristic jump of the electric polarization. The linear and quadratic magnetoelectric effects and the question of the relativistic canting of the sublattices, which is due to the magnetoelectric interaction, are examined. The proposed approach is a natural generalization of the method of constructing invariants from the magnetic modes of the crystal to the case of phase transitions with a doubled unit cell of the crystal and can be used for symmetry analysis of other ferroelectric magnetic compounds.

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Polarization-optical observation of ferroelastic domains in the incommensurate phase of BaMnF₄

Abstract: The first direct observation by mea ns of polarized light microscopy of the fc rroclastic do ma ins o f the .../' incommensurate phase (average monoclinic symmetry) o f Ba MnF. is re porte d .

Cited by 6 publications

References 15 publications

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Polarized Light Microscopy (PLM) of Ferroelectric and Ferroelastic Domains in Transmitted and Reflected Light

Symmetry and magnetoelectric interactions in BaMnF4

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Polarization-optical observation of ferroelastic domains in the incommensurate phase of BaMnF4

Abstract: The first direct observation by mea ns of polarized light microscopy of the fc rroclastic do ma ins o f the .../' incommensurate phase (average monoclinic symmetry) o f Ba MnF. is re porte d .

Cited by 6 publications

References 15 publications

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Polarized Light Microscopy (PLM) of Ferroelectric and Ferroelastic Domains in Transmitted and Reflected Light

Symmetry and magnetoelectric interactions in BaMnF4

Contact Info

Product

Resources

About

Polarization-optical observation of ferroelastic domains in the incommensurate phase of BaMnF₄