pISSN 0374-4914 eISSN 2289-0041

## Research Paper

New Phys.: Sae Mulli 2020; 70: 822-828

Published online October 30, 2020 https://doi.org/10.3938/NPSM.70.822

## Comparison of the Giant Magnetoresistances and Planar Hall Resistances for Multilayera Based on the Antiferromagnet IrMn for use in Magnetic Sensors

Se-Hoon NOH, Sang-Su PARK, Sang-Suk LEE*

Department of Oriental Biomedical Engineering, Sangji University, Wonju 26339, Korea

Correspondence to:sslee@sangji.ac.kr

Received: August 1, 2020; Revised: August 31, 2020; Accepted: August 31, 2020

### Abstract

The sensitivities of giant magnetoresistance (GMR) and planar Hall resistance (PHR) from different classes of magnetic multilayers were compared for biosensing applications. The magnetoresistance ratio (MR), exchange coupling field ($H_{\text{ex}}$), coercivity ($H_{\text{c}}$), interlayer coupling field ($H_{\text{int}}$), and magnetic sensitivity (MS) were measured, and in each sample, the thickness of the nonmagnetic Cu layer was varied to control magnetic exchange interactions and other magnetic characteristics to ensure that the MR and the PHR were more sensitive to the magnetic field. In each case, we found that the sensitivities of the MR and the PHR with respect to the magnetic field were greatly enhanced as the thickness of the Cu layer was increased, thus suggesting a way to engineer highly sensitive MR and PHV devices for use in biosensors.

Keywords: Giant magnetoresistance-spin valve (GMR-SV), Planar Hall voltage (PHV), Magnetic sensitivity (MS), Interlayer coupling field, Magnetoresistance ratio (MR)