Year: 2025
Type: article
Abstract: An integrated magnetic flux concentrator (MFC) has become a choice for enhancing the sensitivity of a magnetic field sensor. However, the flux concentrator’s geometry and its ultra-soft magnetic properties are the key ingredients for successful implementation to improve the detectability of a magnetic sensor. In this report, the laminated stack of Ta/Ru/[NiFe(tNiFe)/Ta(tTa)]N/Ta of thickness 0.5 μm was investigated, where tNiFe, tTa, and N were varied to optimize ultra-soft magnetic properties of the film and compared them with the bulk NiFe film. Structural investigations revealed that incorporating an ultra-thin layer of Ta in the laminated stack suppresses the grain growth of the NiFe phase and improves the textured growth of the fcc(111) phase of the NiFe alloy. This results in dramatic improvement of the measured magnetic hysteresis loop of the laminated stack with a reduced coercivity field in the range of 0.4 ± 0.1 Oe, high linearity, and low saturation field (<10 Oe) while comparing them with the bulk film of NiFe of equivalent thicknesses. The laminated stack thickness of up to 4 μm was further investigated, and the bilinear M(H) loop was explained through antiferromagnetic (AFM) interlayer coupling between successive NiFe layers.
Source: Journal of Applied Physics
DOI: 10.1063/5.0283171
Authors: Gopika C. T., Apoorva Kaul, Bhagaban Behera, S. K. Ghosh, A. Biswas, Santosh Kumar Sahoo, S. Narayana Jammalamadaka, P. Chowdhury
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Award: G8709055485
OpenAlex ID: W4413194602