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Enhanced Coupling Between Soft Ferromagnetism and Displacive Ferroelectricity in the Pb‐Site Modified PbFe$_{1/2}$Nb$_{1/2}$O$_{3}$

Park, Ji-Hun; Cho, Jae-Hyeon; Lee, Nyun Jong; Lee, Hyun-Jae; Lee, Ju-Hyeon; Lee, Geon-Ju; Marlton, Frederick P.; Suzuki, Motohiro; Hinterstein, Manuel 1,2; Oh, Yoon Seok; Choi, Ji-Won; Hwang, Geon-Tae; Lee, Jun Hee; Kim, Sanghoon; Kim, Kee Hoon ; Jo, Wook
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien (IAM), Karlsruher Institut für Technologie (KIT)

Abstract:

Albeit having great potential toward unprecedented type of applications
such as magnetoelectric (ME) sensors and memories, practically useful single-phase multiferroics that show large coupling between ferromagnetism and ferroelectricity at ambient temperatures are still lacking. Here, the discovery of a new type of perovskite ferroelectrics (Pb,M)(Fe$_{1/2}$Nb$_{1/2}$)O$_3$ (M = Fe, Co, Ni) is reported with a magnetically-active metal ion introduced into a cuboctahedrally-coordinated Pb position, which exhibits enhanced ME coupling owing to the development of simultaneous soft-ferromagnetism and lone-pair ferroelectricity persistent above room temperature. These Pb-site engineered (Pb,M)(Fe$_{1/2}$Nb$_{1/2}$)O$_3$ perovskites exhibit a ME coupling coefficient of ≈40–60 ps m$^{−1}$ , a saturated electric polarization of 14–17 μC cm$^{−2}$ and a saturation magnetization of 0.15–0.3 μB f.u$^{−1}$. X-ray absorption spectroscopy combined with first-principles calculations demonstrates that the induced ferromagnetism originates from the ferromagnetic superexchange interaction coming from ≈90° bonding between the magnetic ions at the Pb site. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000175773
Veröffentlicht am 30.10.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 2199-160X
KITopen-ID: 1000175773
Erschienen in Advanced Electronic Materials
Verlag John Wiley and Sons
Seiten Art.-Nr.: 2400370
Vorab online veröffentlicht am 16.10.2024
Nachgewiesen in Scopus
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