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Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO6

DOI: 10.1103/PhysRevB.103.094110 DOI Help

Authors: Moein Adnani (University of Houston) , Melissa Gooch (University of Houston) , Liangzi Deng (University of Houston) , Stefano Agrestini (ALBA Synchrotron Light Source; Diamond Light Source) , Javier Herrero-Martin (ALBA Synchrotron Light Source) , Hung-Cheng Wu (University of Houston; National Sun Yat-Sen University) , Chung-Kai Chang (National Synchrotron Radiation Research Center) , Taha Salavati-Fard (University of Houston) , Narayan Poudel (University of Houston) , Jose Luis Garcia-Munoz (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)) , Samira Daneshmandi (University of Houston) , Zheng Wu (University of Houston) , Lars C. Grabow (University of Houston) , Yen-Chung Lai (National Synchrotron Radiation Research Center) , Hung-Duen Yang (National Sun Yat-Sen University) , Eric Pellegrin (ALBA Synchrotron Light Source) , Ching-Wu Chu (University of Houston; Lawrence Berkeley National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 103

State: Published (Approved)
Published: March 2021

Abstract: We have investigated the multiferroicity and magnetoelectric (ME) coupling in Ho Fe W O 6 . With a noncentrosymmetric polar structure (space group Pna 2 1 ) at room temperature, this compound shows an onset of electric polarization with an antiferromagnetic ordering at the Néel temperature ( T N ) of 17.8 K. The magnetic properties of the polycrystalline samples were studied by DC and AC magnetization and heat capacity measurements. The metamagnetic behavior at low temperatures was found to be directly related to the dielectric properties of the compound. In particular, field-dependent measurements of capacitance show a magnetocapacitance (MC) effect with double-hysteresis loop behavior in direct correspondence with the magnetization. Our x-ray diffraction results show the Pna 2 1 structure down to 8 K and suggest the absence of a structural phase transition across T N . Soft x-ray absorption spectroscopy and soft x-ray magnetic circular dichroism (XMCD) measurements at the Fe L 2 , 3 and Ho M 4 , 5 edges revealed the oxidation state of Fe and Ho cations to be 3 + . Fe L 2 , 3 XMCD further shows that Fe 3 + cations are antiferromagnetically ordered in a noncollinear fashion with spins arranged 90 ∘ with respect to each other. Our findings show that Ho Fe W O 6 is a type-II multiferroic exhibiting a MC effect. The observed MC effect and the change in polarization by the magnetic field, as well as their direct correspondence with magnetization, further support the strong ME coupling in this compound.

Diamond Keywords: Ferroelectricity; Ferromagnetism

Subject Areas: Physics, Materials

Facility: BL29 at ALBA

Added On: 23/03/2021 07:16

Discipline Tags:

Materials Science Multiferroics

Technical Tags: