Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Shang, T.; Yang, Haolin; Zhan, Qingfeng; Zuo, Zhiwei; Xie, Yurong; Liu, L. P.; Zhang, S. L.; Zhang, Y.; Li, H. H.; Wang, Baomin; Wu, Yang; Zhang, S.; Li, Run Wei

doi:10.1063/1.4964114

Cited by 7 publications

(1 citation statement)

References 40 publications

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“…It is noteworthy that T N of IrMn falls below room temperature for t IrMn ≤ 2.7 nm, indicating the prominent role of AF spin fluctuation in spin transport for this thickness range [37–38]. A similar dynamic spin transport through metallic IrMn layers of up to 3 nm of thickness via AF spin excitations has also been previously reported in Pt/IrMn/YIG heterostructures using spin-torque FMR [17]. Also, a highly efficient spin current transfer from Y 3 Fe 5 O 12 (YIG) into NiO and subsequent spin propagation in NiO with spin decay lengths (healing length) of up to 10 nm has been reported by Wang and co-workers [15].…”

Section: Resultssupporting

confidence: 65%

Influence of the thickness of an antiferromagnetic IrMn layer on the static and dynamic magnetization of weakly coupled CoFeB/IrMn/CoFeB trilayers

Jhajhria

Pandya

Chaudhary

2018

Beilstein J. Nanotechnol.

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The static and dynamic magnetization response of the CoFeB/IrMn/CoFeB trilayer system with varying thickness of the antiferromagnetic (AF) IrMn layer is investigated using magnetization hysteresis (M–H) and ferromagnetic resonance (FMR) measurements. The study shows that the two CoFeB layers are coupled via a long-range dynamic exchange effect through the IrMn layer up to a thickness of 6 nm. It is found that with the increase in IrMn layer thickness a nearly linear enhancement of the effective magnetic damping constant occurs, which is associated with the simultaneous influence of spin pumping and interlayer exchange coupling effects. An extrinsic contribution to the linewidth originating from the two-magnon scattering is also discussed. The AF-induced interfacial damping parameter is derived by studying the evolution of damping with inverse CoFeB thickness. The static magnetic measurements also reveal the interlayer exchange coupling across the IrMn layer both at room temperature and low temperature. The asymmetric hysteresis loop and training effect observed at low temperature is related to the presence of a metastable AF domain state. We show that both the static and dynamic magnetic properties of trilayer films can be adjusted over a wide range by changing the thickness of the IrMn spacer layer.

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Section: Resultssupporting

confidence: 65%

Influence of the thickness of an antiferromagnetic IrMn layer on the static and dynamic magnetization of weakly coupled CoFeB/IrMn/CoFeB trilayers

Jhajhria

Pandya

Chaudhary

2018

Beilstein J. Nanotechnol.

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Unveiling a Hidden Order Transition at the Interface of an Exchange-Spring-Coupled Ferromagnet/Antiferromagnet Bilayer

Yang,

Tseng,

Chen

et al. 2024

ACS Appl. Electron. Mater.

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Study of the exchange bias (H ex ) switching in a ferromagnet (FM)/ antiferromagnet (AFM) bilayer driven by spin−orbit torque (SOT) has currently been an explicit research field for various SOT applications, but a complete understanding of AFM and its interaction with SOT at an FM/AFM interface remains elusive. This study reports an SOT-driven hidden order transition behind the H ex in a heavy metal (Pt)/FM (Co)/AFM (IrMn) trilayer along with the interaction between Co magnetization (with perpendicular anisotropy) and IrMn spins. The exchange coupling across the Co/IrMn interface facilitates a long-range spin order in the form of an exchange-spring configuration, resulting in two distinct orders in IrMn: a canting-induced FM order (m) responsible for hosting H ex and a hidden Neél order (n) representing the AFM nature. The SOT generated in Pt appeared to disturb the order in IrMn when it was first applied to the device, leading to the reduction in m along the perpendicular direction and an increase in the component of n along the current axis; therefore, a diminished H ex along with a developed planar anisotropic magnetoresistance (MR) can be observed. The coupled transitions of m and n appear to be irreversibly driven by SOT and independent of current polarity at the first SOT measurement. Subsequent SOT measurements reveal a reversible switching of m, manifested by the reversible H ex switching while n remains unaltered along the current axis, as indicated by the unchanged anisotropic MR. This work unveils a hidden Neél order transition at a fully dynamic FM/AFM interface.

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Electrical readout of the antiferromagnetic state of IrMn through anomalous Hall effect

Asa

Rinaldi

Pazzocco

et al. 2020

Journal of Applied Physics

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We report the electrical detection of the antiferromagnetic state of IrMn through anomalous Hall measurements in Ta/IrMn heterostructures. The magnetic state is set in the antiferromagnet through field cooling and detected electrically by transverse resistance measurements in Hall bar structures without the need for any ferromagnetic layer. The amplitude of the signal increases with the magnetic field applied during the cooling and is enhanced by the proximal interface with a Ta layer. From the temperature dependence of the effect and the comparison between Ta/IrMn and Ru/IrMn interfaces, we propose an explanation of such readouts based on the simultaneous occurrence of spin-Hall magnetoresistance and magnetic proximity in Ta. These findings highlight how interface effects could be generally employed for the investigation of antiferromagnetic materials as well as for the electrical readout of the antiferromagnetic state.

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Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Cited by 7 publications

References 40 publications

Influence of the thickness of an antiferromagnetic IrMn layer on the static and dynamic magnetization of weakly coupled CoFeB/IrMn/CoFeB trilayers

Influence of the thickness of an antiferromagnetic IrMn layer on the static and dynamic magnetization of weakly coupled CoFeB/IrMn/CoFeB trilayers

Unveiling a Hidden Order Transition at the Interface of an Exchange-Spring-Coupled Ferromagnet/Antiferromagnet Bilayer

Electrical readout of the antiferromagnetic state of IrMn through anomalous Hall effect

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