Interface Tailoring Effect for Heusler Based CPP-GMR with an L12-Type Ag3Mg Spacer
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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
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, Co2
Si (CFMS), based CPP-GMR junctions with an
Mg ordered alloy spacer. Ultra-thin Fe or Mg inserts were utilized for the CFMS/Ag3
Mg 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
was evaluated by the shape of MR curves depending on J
increased with the insert thicknesses up to 0.45 nm. The enhancement of
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.
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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MDPI and ACS Style
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.
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(2):219.
Kubota, Takahide; Ina, Yusuke; Wen, Zhenchao; Takanashi, Koki. 2018. "Interface Tailoring Effect for Heusler Based CPP-GMR with an L12-Type Ag3Mg Spacer." Materials 11, no. 2: 219.
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