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Materials 2018, 11(2), 219; https://doi.org/10.3390/ma11020219

Interface Tailoring Effect for Heusler Based CPP-GMR with an L12-Type Ag3Mg Spacer

1
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2
Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
*
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 19 January 2018 / Accepted: 29 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Magnetoresistance Effects and Their Application to Spintronic Devices)
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Abstract

Current perpendicular-to-plane (CPP) giant magnetoresistance (GMR) effects are of interest in a possible application of magnetic sensor elements, such as read-head of hard disk drives. To improve the junction performance, the interface tailoring effects were investigated for the Heulser alloy, Co2Fe0.4Mn0.6Si (CFMS), based CPP-GMR junctions with an L 1 2 -Ag3Mg ordered alloy spacer. Ultra-thin Fe or Mg inserts were utilized for the CFMS/Ag3Mg interfaces, and CPP-GMR at low bias current density, J and the J dependence were evaluated for the junctions. Although, at low bias J, MR ratio decreased with increasing the inserts thickness, the device output at high bias J exhibited quite weak dependence on the insert thickness. The output voltages of the order of 4 mV were obtained for the junctions regardless of the insert at an optimal bias J for each. The critical current density J c was evaluated by the shape of MR curves depending on J. J c increased with the insert thicknesses up to 0.45 nm. The enhancement of J c suggests that spin-transfer-torque effect may reduce in the junctions with inserts, which enables a reduction of noise and can be an advantage for device applications. View Full-Text
Keywords: CPP-GMR; heusler alloy; hard disk drive; spintronics; magnetoresistance CPP-GMR; heusler alloy; hard disk drive; spintronics; magnetoresistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kubota, T.; Ina, Y.; Wen, Z.; Takanashi, K. Interface Tailoring Effect for Heusler Based CPP-GMR with an L12-Type Ag3Mg Spacer. Materials 2018, 11, 219.

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