Electric field controlled magnetic switching in multiferroic hetero structures towards ultra-low power magnetic memory application

自旋电子学中自旋电流的有效产生、控制和检测一直是自旋电子学研究的热点。其中，对于从重金属，无机氧化物，采用自旋泵浦（SP）和逆自旋霍尔效应（ISHE）相结合的方法，对铂金属（Pt）的自旋霍尔角进行了定量研究。14千兆赫。我们还研究了磁化进动角估计在SP-ISHE效应分析中不可或缺的作用。这在集成共面波导结构的情况下是重要的，其中微波场分布是非常关键的，并且有时导致自旋霍尔角的不正确估计。因此，在4-14 GHz的宽频率范围内的铁磁共振激励下的磁化进动角估计的不同技术进行了比较分析。结果和观察结果已在2016年在美国举行的磁学和自旋电子学国际会议上以口头形式发表，并于2017年发表在国际知名期刊“应用物理快报”上。

Efficient generation, manipulation and detection of spin-current have attracted much interest in spintronics. Wherein, the unambiguous estimation of spin-to-charge interconversion efficiency also known as spin Hall angle for large variety of materials ranging from heavy metals, inorganic oxides, semiconductors to organic polymers is the key area of research.We implemented the combined approach of spin pumping (SP) and inverse spin Hall effect (ISHE) to quantify spin Hall angle of Platinum meatal (Pt) for broad frequency range of 4-14 GHz. We also investigated the indispensable role of magnetization precession angle estimation in the analysis of SP-ISHE effect. It is important in case of integrated co-planar waveguide architecture where microwave field distribution is very crucial and sometime leads to incorrect estimation of spin Hall angle. Thus, different techniques for magnetization precession angle estimation upon ferromagnetic resonance excitation in broad frequency range of 4-14 GHz are comparatively analyzed. The results and observation have been presented in oral form in international conferences on magnetism amd spintronics held in US in year 2016 as well as published in international journal of high repute “Applied Physics Letter” in year 2017.