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$Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$$

Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$

by Dhanasekhar, C , Mariserla, Bala M K , Deckoff-Jones, Skylar , E Laine Wong , Talbayev, Diyar , Madeo, Julien , Adyam, Venimadhav , Man, Michael K L , Dani, Keshav M , Harada, Takaaki , Yu, Shukai

in Absorption spectra / Dependence / Electrons / Ferrimagnetism / Magnetic fields / Nickel / Phonons / Refractivity / Terahertz frequencies

2017

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Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$

by Dhanasekhar, C , Mariserla, Bala M K , Deckoff-Jones, Skylar , E Laine Wong , Talbayev, Diyar , Madeo, Julien , Adyam, Venimadhav , Man, Michael K L , Dani, Keshav M , Harada, Takaaki , Yu, Shukai

in Absorption spectra / Dependence / Electrons / Ferrimagnetism / Magnetic fields / Nickel / Phonons / Refractivity / Terahertz frequencies

2017

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$Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$$

Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$

by Dhanasekhar, C , Mariserla, Bala M K , Deckoff-Jones, Skylar , E Laine Wong , Talbayev, Diyar , Madeo, Julien , Adyam, Venimadhav , Man, Michael K L , Dani, Keshav M , Harada, Takaaki , Yu, Shukai

in Absorption spectra / Dependence / Electrons / Ferrimagnetism / Magnetic fields / Nickel / Phonons / Refractivity / Terahertz frequencies

2017

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$Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$$

Paper

Terahertz frequency magnetoelectric effect in Ni doped CaBaCo\$_4\$O\$_7\$

Dhanasekhar, C,

Mariserla, Bala M K,

Deckoff-Jones, Skylar,

E Laine Wong,

Talbayev, Diyar,

Madeo, Julien,

Adyam, Venimadhav,

Man, Michael K L,

Dani, Keshav M,

Harada, Takaaki,

Yu, Shukai

2017

Overview

We present a study of terahertz frequency magnetoelectric effect in ferrimagnetic pyroelectric CaBaCo\$_4\$O\$_7\$ and its Ni-doped variants. The terahertz absorption spectrum of these materials consists of spin excitations and low-frequency infrared-active phonons. We studied the magnetic-field-induced changes in the terahertz refractive index and absorption in magnetic fields up to 17 T. We find that the magnetic field modulates the strength of infrared-active optical phonons near 1.2 and 1.6 THz. We use the Lorentz model of the dielectric function to analyze the measured magnetic-field dependence of the refractive index and absorption. We propose that most of the magnetoelectric effect is contributed by the optical phonons near 1.6 THz and higher-frequency resonances. Our experimental results can be used to construct and validate more detailed theoretical descriptions of magnetoelectricity in CaBaCo\$_{4-x}\$Ni\$_x\$O\$_7\$.

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Publisher

Cornell University Library, arXiv.org

Subject

/ Nickel

/ Phonons