Designing ferroelectric/ferromagnetic composite with giant self-biased magnetoelectric effect
- Designing ferroelectric/ferromagnetic composite with giant self-biased magnetoelectric effect
- 송현철; Bipul Deka; Yong-Woo Lee; Il-Ryeol Yoo; Do-Woo Gwak; Jiung Cho; Jong-Jin Cho; Byung-Dong Hahn; Cheol-Woo Ahn; Kyung-Hoon Cho
- Issue Date
- Applied physics letters
- VOL 115-192901-5
- We report a simple and effective method to obtain the magnetoelectric (ME) effect at zero magnetic bias field (HDC ¼ 0), i.e., the self-biased ME (SME) effect, using an ME laminate composite clamped at its center with its free ends loaded with magnetic tip masses. The method
exploits the shifting of the magnetic hysteresis loop of the ferromagnetic (FM) layer of the laminate induced by a preapplied magnetic field (Hp) along the longitudinal direction. The optimum magnetic-field strength corresponding to the maximum of the ME voltage coefficient
(aME) vs HDC curve was calculated using equations derived from correlations of magnetic coefficients. In experiments involving the laminate with an FM/ferroelectric/FM symmetrical structure, the strength of Hp was tuned to the optimum value, shifting the aME vs HDC curve along the HDC axis enough to obtain the maximum aME at HDC ¼ 0 (aSME). To further enhance aSME, an asymmetric configuration of the laminate was designed using two different FM materials having piezomagnetic coefficients with opposite signs. The ME laminate with the asymmetrical structure exhibited a large aSME of 55.7 V cm1 Oe1 at its bending resonance frequency.
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