Magnetic and electrical properties are two basic functional properties of the material.How to integrate the electrical and magnetic properties into the same system and to control the two properties of the magnetic field and the electric field is an important research direction of advanced multifunctional electronic devices in the future .
The Chinese Academy of Sciences Institute of Physics Longyou Wen team, through the unique high-pressure high temperature experimental device developed in the world for the first time in the world with large electric polarization and strong magnetoelectric coupling effect of new single-phase multi-iron material BiMn3Cr4O12. This development The next generation of information memory, adjustable microwave signal processor, ultra-sensitive magnetic sensors, magnetic transducers and other potential good.the results recently published in the internationally renowned material journals "advanced materials", as the current period of the cover of the recommended Scientific progress.
Semiconductor and magnetic recording / storage devices, which are widely used daily, can usually only make use of the electrical or magnetic properties of the material alone. In order to make the material possess both magnetostrictive properties, it is theoretically possible to synthesize magnetoelectric multiferroic materials. However, , The existing single-phase multiferroic material can not have both large electric polarization and strong magneto-electric coupling effect, which greatly hinders its potential application.
Long Wenwen introduction, the past of such materials preparation, usually carried out under atmospheric conditions.This time, the team to break the conventional restrictions, the use of their own unique high-pressure high-temperature experimental setup, up to 80,000 atmospheres of ultra-conventional experimental conditions, The first successful preparation of a new multi-iron material BiMn3Cr4O12.
In this system, the introduction of trivalent bismuth ions induces the ferroelectric phase transition with large electric polarization at higher temperature.With the decrease of temperature, the trivalent chromium and manganese magnetic ions form the long-range magnetic ordered structure , Respectively, induce the first and second types of multi-phase iron.The rare coexistence of these two types of multi-iron phase, so that the material has both large electric polarization and strong magnetoelectric coupling effect.At the same time, the new material can also be individually regulated two A ferroelectric phase, to achieve four-iron electrode state conversion, as polymorphic storage possible.
