Interfacial Magnetic Anisotropy Controlled Spin Pumping in Co60Fe20B20/Pt Stack

Author:

Tahir Mahammad1,Tiwari Dhananjay2,Juyal Abhishek34,Medwal Rohit1,Mukhopadhyay Soumik1

Affiliation:

1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India

2. Frontend Integrated Circuits and Systems Silicon Austria Labs GmbH, Villach - 9524, Austria

3. Georgia Tech Lorraine IRL 2958 – CNRS 57070 Metz, France

4. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

Abstract

Controlled spin transport in magnetic stacks is required to realize pure spin current-driven logic and memory devices. The control over the generation and detection of the pure spin current is achieved by tuning the spin to charge conversion efficiency of the heavy metal interfacing with ferromagnets. Here, we demonstrate the direct tunability of spin angular momentum transfer and thereby spin pumping, in CoFeB/Pt stack, with interfacial magnetic anisotropy. The ultra-low thickness of the CoFeB thin film by tilting the magnetization from in-plane to out-of plane direction due to interfacial anisotropy from higher thickness of CoFeB thin film. The ferromagnetic resonance measurements are performed to investigate the magnetic anisotropy and spin pumping in CoFeB/Pt stacks. We clearly observe tunable spin pumping effect in the CoFeB/Pt stacks with varying CoFeB thicknesses. The spin current density, with varying ferromagnetic layer thickness, is found to increase from 1.10[Formula: see text]MA/m2 to 2.40[Formula: see text]MA/m2, with increasing in-plane anisotropy field. Such interfacial anisotropy-controlled generation of pure spin current can potentially lead to next-generation anisotropic spin current-controlled spintronic devices.

Funder

IIT Kanpur

Publisher

World Scientific Pub Co Pte Ltd

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