Abstract
Magnetoelectric coupling effect has provided a power efficient approach in controlling the magnetic properties of ferromagnetic materials. However, one remaining issue of ferromagnetic/ferroelectric magnetoelectric bilayer composite is that the induced effective anisotropy disappears with the removal of the electric field. The introducing of the shape memory alloys may prevent such problem by taking the advantage of its shape memory effect. Additionally, the shape memory alloy can also “store” the magnetoelectric coupling before heat release, which introduces more functionality to the system. In this paper, we study a FeGaB/NiTi/PMN-PT multiferroic heterostructure, which can be operating in different states with electric field and temperature manipulation. Such phenomenon is promising for tunable multiferroic devices with multi-functionalities.
Highlights
Multiferroic composites with combined ferroelectric (FE) and ferromagnetic (FM) phase have attracted a lot of interests due to strong magnetoelectric (ME) coupling at room temperature[1,2,3,4,5,6,7]
Without Nickel Titanium (NiTi), the ME coupling induced ferromagnetic resonant (FMR) field shift is shifted within a magnitude range of ~230 Oe, upto FMR field of 980 Oe; in contrast, with NiTi shape memory alloy, the ME coupling induced FMR shift has a magnitude of ~160 Oe
In FeGaB/NiTi/PMN-PT multiferroic heterostructure, the strain of NiTi can be released at high temperature environment or by applying a temperature, the “locked” small ME tunability was unlocked to large ME tunability state
Summary
Multiferroic composites with combined ferroelectric (FE) and ferromagnetic (FM) phase have attracted a lot of interests due to strong magnetoelectric (ME) coupling at room temperature[1,2,3,4,5,6,7]. The tunability of the corresponded devices are up to 200 MHz (10%) for filters[25], and 180° for phase shifters[26] To overcome such issue, metal/ferroelectric heterostructures are developed and reported with large ME coupling coefficients[27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46], which has potential for RF/microwave applications. By changing the temperature (such as applying laser impulses), the strain state of NiTi can be switched back and forth with non-volatility This unique mechanism raise up a question: can different strain state affect the strain/stress induced ME coupling? Our work reveals a phenomenon of memory effect of SMAs based multiferroic heterostructure that may open a bright future for advanced ME devices with creative functionality
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
