Exchange bias in (FeNi/IrMn)<i>n</i>multilayer films evaluated by static and dynamic techniques

Khanal, Shankar; Diaconu, Andrei; Vargas, J. M.; Lenormand, Denny; García, Carlos; Ross, Caroline A.; Spînu, Leonard

doi:10.1088/0022-3727/47/25/255002

Cited by 15 publications

(10 citation statements)

References 38 publications

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“…In this case, the distribution of the strain throughout the multilayer may induce randomly oriented local anisotropies, leading to differences in the exchange coupling of distinct interfaces. Similar behavior have been previously verified for NiFe/IrMn multilayers [15]. For NiFe layers thicker than 20 nm, the relaxation of the stress is enough to vanish this effect.…”

Section: Resultssupporting

confidence: 87%

Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Silva

Mori

et al. 2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tWe investigate the asymmetric magnetoimpedance effect in exchange biased NiFe/IrMn multilayers and explore the possibility of tailoring the linear region of the curves around zero magnetic field by playing with the thickness of the ferromagnetic layers, probe current frequency, and the orientation between external magnetic field and exchange bias field direction. We quantify the sensitivity by calculating the dZ dH / H 0 | | = in a wide range of frequencies. The highest sensitivity is observed for the thicker multilayer, reaching 160 m /Oe ∼ Ω at ∼2.0 GHz. The results place exchange biased magnetoimpedance multilayers as attractive candidates for the development of auto-biased linear magnetic field sensors.

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Section: Resultssupporting

confidence: 87%

Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Silva

Mori

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…Figure 1a shows a schematic of the GMR SHO device. The device is a nanowire made from antiferromagnetic (AFM)/FM/NM/FM/Pt exchange biased spin valve multilayer, where the direction of magnetization of the bottom FM layer is pinned by exchange bias field from the AFM layer [38][39][40] . Direct electric current flowing along the nanowire in the heavy metal Pt layer applies SHT to magnetization of the adjacent free FM layer and excites its auto-oscillations 15 .…”

Section: Resultsmentioning

confidence: 99%

Spin–orbit torque nano-oscillator with giant magnetoresistance readout

et al. 2020

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Spin-orbit torque nano-oscillators based on bilayers of ferromagnetic and nonmagnetic metals are ultra-compact current-controlled microwave signal sources. They are attractive for practical applications such as microwave assisted magnetic recording, neuromorphic computing, and chip-to-chip wireless communications. However, a major drawback of these devices is low output microwave power arising from the relatively small anisotropic magnetoresistance of the ferromagnetic layer. Here we experimentally show that the output power of a spin-orbit torque nano-oscillator can be significantly enhanced without compromising its structural simplicity. Addition of a ferromagnetic reference layer to the oscillator allows us to employ current-in-plane giant magnetoresistance to boost the output power of the device. This enhancement of the output power is a result of both large magnitude of giant magnetoresistance compared to that of anisotropic magnetoresistance and their different angular dependencies. Our results hold promise for practical applications of spin-orbit torque nano-oscillators.

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“…The similar coercivities between samples at room temperature but largely differing H EB values are consistent with previous studies. 16 H EB can be determined dynamically from the FMR measurements taking half of the sum of resonance fields, H R , at a given frequency for fields along (0 • ) H EB as well as antiparallel to (180 • ) H EB . Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Thickness of the individual ferromagnetic layers and number of repetitions across the samples are given by t = 20, 60, 80 nm and n = 10, 5, 4, and the samples are named S1, S2, S3, respectively (see Table 1 in Ref. 16). The samples were cut to similar sizes for experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Major hysteresis loops were recorded in the temperature range of 300 K to 2 K to reveal the effect of temperature on the exchange bias in the static regime while temperature-dependent continuous-wave ferromagnetic resonance for frequencies from 3 to 16 GHz was used to determine the exchange bias dynamically. Strong divergence between the values of exchange bias determined using the two different types of measurements as well as a peak in temperature dependence of the resonance linewidth were observed.…”

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confidence: 99%

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Temperature dependence of exchange bias in (NiFe/IrMn)n multilayer films studied through static and dynamic techniques

et al. 2017

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The in-plane temperature dependence of exchange bias was studied through both dc magnetometry and ferromagnetic resonance spectroscopy in a series of [NiFe/IrMn]n multilayer films, where n is the number of layer repetitions. Major hysteresis loops were recorded in the temperature range of 300 K to 2 K to reveal the effect of temperature on the exchange bias in the static regime while temperature-dependent continuous-wave ferromagnetic resonance for frequencies from 3 to 16 GHz was used to determine the exchange bias dynamically. Strong divergence between the values of exchange bias determined using the two different types of measurements as well as a peak in temperature dependence of the resonance linewidth were observed. These results are explained in terms of the slow-relaxer mechanism.

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Exchange bias in (FeNi/IrMn)nmultilayer films evaluated by static and dynamic techniques

Cited by 15 publications

References 38 publications

Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Spin–orbit torque nano-oscillator with giant magnetoresistance readout

Temperature dependence of exchange bias in (NiFe/IrMn)n multilayer films studied through static and dynamic techniques

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