Self-biased converse magnetoelectric effect

Abstract

In this letter, we investigate the direct magnetoelectric (DME) and converse magnetoelectric (CME) effects in three-phase metal–ceramic laminate composites. Longitudinally poled and transversely magnetized (L-T) laminate was fabricated by bonding nickel plates between the two particulate magnetoelectric (ME) composite layers of composition 0.8 (0.948 K0.5Na0.5NbO3 – 0.052 LiSbO3) – 0.2 (Ni0.8Zn0.2Fe2O4) (KNNLS-NZF). Under off-resonance condition, the laminates exhibited hysteretic DME and CME responses as a function of applied bias field (Hbias). Self-biased effect characterized by non-zero ME response at zero Hbias was observed. The self-biased DME and CME properties were found to be enhanced under resonance conditions. Without external Hbias, magnetic induction switching was possible by applying AC voltage. These results provide the possibility of using self-biased CME effect in electrically controlled memory devices and magnetic flux control devices.

Integration of c-axis oriented Bi3.15Nd0.85Ti2.95Hf0.05O12/La0.67Sr0.33MnO3 ferromagnetic-ferroelectric composite film on Si substrate

“…The large α E values were obtained in the absence of H bias , suggesting the existence of self-biased magnetoelectric effect. It is necessary to illustrate that the self-biased magnetoelectric effect was previously observed in three-phase metal-magnetoelectric ceramic laminate composites when the laminates were operated in bending mode and consisted of dissimilar or graded magnetic materials that resulted in built-in magnetic bias 62–65 . In present work, the emergence of the self-biased magnetoelectric effect in the BNTH 0.05 /LSMO/LNO film might be attributed to two causes.…”

“…As a result, the requirement of additional large H bias would be problematic for the application of ferromagnetic-ferroelectric composite materials in devices. The discovery of self-biased ME effect in the BNTH 0.05 /LSMO/LNO film is encouraging for exploring its potential applications such as self-biased magnetic field sensor 65 . Figure 11 also shows the α E values response in the same frequency range at H bias  = 200 Oe, and the same trend that the α E value gradually increased from zero with the increase of the AC frequency was observed.…”

Giant self-biased converse magnetoelectric effect in multiferroic heterostructure with single-phase magnetostrictive materials

“…18 Recently, great efforts have been devoted to developing the self-biased CME effects in three-phase multiferroic composite of 0.8(0.948 K 0.5 Na 0.5 NbO 3 -0.052LiSbO 3 )-0.2(Ni 0.8 Zn 0.2 Fe 2 O 4 ) (KNNLS-NZF), exhibiting a non-zero CME coefficient a CME of 2.6 Â 10 À6 mGÁcm/V at H bias ¼ 0 (a CME ¼ dV/dB, or called remnant CME coefficient), whereby a built-in magnetic field generated by significant difference in magnetic characteristics (e.g., magnetization, susceptibility, coercivity, magnetostriction, and piezomagnetic coefficient) between two different ferromagnetic materials of Ni and NZF, and this approach for realizing the self-biased CME response is dependent upon the compositionally stepped ferromagnetic materials with grading of piezomagnetic coefficients and requires special synthesis process. 19 However, during the synthesis process, some intrinsic preparation problems such as atomic interfacial inter-diffusion, chemical reaction, and thermal expansion mismatch will happen inevitably. Therefore, these disadvantages present new challenges of practical applications for realization of high-density and compact magnetic storage devices.…”

Synthesis and room temperature four-state memory prototype of Sr3Co2Fe24O41 multiferroics

“…What's more, it exhibits a strong magnetoelectric effect at room temperature after electric polarization, which is similar to other multiferroic composites. [28][29][30] The magnetoelectric coupling between the weak magnetic field (H ac ) and measured electric signal could be through the induced strain. It is known that the magnetoelectric effect is represented by the magnetoelectric coefficient (a E ), which is defined by a E ¼ dV/H ac , where H ac is a weak ac magnetic field around the pellet and V is the continuation voltage output signal induced by H ac .…”