Characterization of Coupled Novel Magnetic Multilayers With Anomalous Hall Effect

Wong, Seng Kai; Srinivasan, Kumar; Sbiaa, R.; Law, Randall; Tan, Eileen; Piramanayagam, S. N.

doi:10.1109/tmag.2009.2039202

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…[4][5][6][7][8][9][10][11][12][13] By coupling the soft to the hard layer, it possible to tune both the static and dynamic responses of the soft layer and derive new functionality. Such coupling can be applied to enhance properties in perpendicular magnetic recording media, 3,4 as well as tuning the reversal properties in high-density bit patterned media [5][6][7][8][9][10] and can be further optimized for microwave assisted magnetic recording. 11 The exchange coupling of the soft layer to the hard layer is also being pursued as a pathway for raising the resonant frequency of the soft layer 12 and the operating frequencies of planar microwave devices.…”

Section: Introductionmentioning

confidence: 99%

Tunable resonant properties of perpendicular anisotropy [Co/Pd]/Fe/[Co/Pd] multilayers

Dou

Pechan

Shipton

et al. 2013

Journal of Applied Physics

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We describe the static and dynamic magnetic behaviors of Fe films (thicknesses 2, 4, and 6 nm) sandwiched between Co/Pd multilayers with strong perpendicular magnetic anisotropy. Out-of-plane measurements of both magnetization and ferromagnetic resonance confirm well-defined Fe layer response modified by large perpendicular exchange field arising from the coupling with the Co/Pd. The field/frequency dispersion is linear for all samples with field intercepts increasing with Fe layer thickness. Analysis in terms of shape anisotropy and interfacial exchange model yields a large outof-plane interfacial coupling of $3.0-3.7 erg/cm 2 that is mediated by the coupling across thin Pd layers. The value of this interface exchange is also shown to be tunable with interfacial Pd thickness.

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Section: Introductionmentioning

confidence: 99%

Tunable resonant properties of perpendicular anisotropy [Co/Pd]/Fe/[Co/Pd] multilayers

Dou

Pechan

Shipton

et al. 2013

Journal of Applied Physics

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“…The anomalous Hall effect (AHE) 1,2 of ultra-thin multilayered (ML) films with large perpendicular magnetic anisotropy (PMA) has recently attracted considerable attention due to its potential applications for high-density magnetic recording technology, such as recording media, magnetic random access memory (MRAM), and magnetic sensors. [3][4][5][6][7] For applications, parameters like squareness and coercivity of the magnetic hysteresis curve and the amplitude of the AHE voltage are desired to be tunable. For instance, the coercivity has to be as small as possible when it is used for magnetic field sensor elements, but it has to be moderately large when it is used for recording media elements.…”

mentioning

confidence: 99%

Temperature and Co thickness dependent sign change of the anomalous Hall effect in Co/Pd multilayers: An experimental and theoretical study

Keskin

Aktaş

Schmalhorst

et al. 2013

Applied Physics Letters

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The anomalous Hall effect in ultra-thin {Co 0.3 nm /Pd 0.5 nm } n multilayers has been investigated recently with respect to surface and interface contributions [Guo et al., Phys. Rev. B 86, 104433 (2012)]. In this work, we observe a Co thickness and temperature dependent sign change also for {Co 0.20-0.55 nm /Pd 1.5nm or 1.8 nm } 9x multilayers, e.g., in layer stacks with considerably thicker Pd layers and hence lower resistivity. The thickness dependent behavior can be reproduced by ab initio calculations of the Hall conductivity, for which only interfacial and bulk contributions play a role. V

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“…As the signal from AHE is inversely proportional to the film thickness, it is a useful technique to study magnetization components of these samples in detail. 17,29 This is especially important, as the thickness of the Co-film is in the range of 0.7 nm to 2.4 nm and the VSM and AGM measurements do not separate out the different components. Therefore, we carried out a systematic study of these samples using AHE at various angles and applied fields.…”

Section: Resultsmentioning

confidence: 99%

“…[17][18][19][20]29 Fig. 8(a) shows anomalous Hall voltage (AHV) and planar Hall voltage (PHV) for the case of 0.75 nm thick Co layer exchange coupled to 17 nm (Co/Pd) multilayer.…”

Section: Resultsmentioning

confidence: 99%

Origin of anomalously high exchange field in antiferromagnetically coupled magnetic structures: Spin reorientation versus interface anisotropy

Ranjbar

Piramanayagam

Wong

et al. 2011

Journal of Applied Physics

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A physical model of exchange bias in [ Pd / Co ] 5 / FeMn thin films with perpendicular anisotropyCorrelation between perpendicular exchange bias and magnetic anisotropy in IrMn ∕ [ Co ∕ Pt ] n and [ Pt ∕ Co ] n ∕ IrMn multilayers Magnetization reorientation from in-plane to perpendicular direction, observed in Co thin film coupled antiferromagnetically to high perpendicular magnetic anisotropy (Co/Pd) multilayers, is studied systematically for Co thickness ranging from 0 to 2.4 nm. The sample with 0.75 nm thick Co showed an exchange coupling field (H ex ) exceeding 15 kOe at room temperature and 17.2 kOe at 5 K. With an increase of Co thickness, H ex decreased as expected and beyond certain thickness, magnetization reorientation was not observed. Indeed, three regions were observed in the thickness dependence of magnetization of the thin layer; one in which the thin layer (in the thickness range up to 0.8 nm) had a perpendicular magnetic anisotropy due to interface effects and antiferromagnetic coupling, another in which the thin layer (0.9-1.2 nm) magnetization had no interface or crystallographic anisotropy but was reoriented in the perpendicular direction due to antiferromagnetic coupling, and the third (above 1.2 nm) in which the magnetization was in-plane. In addition, Hall effect measurements were carried out to observe the anomalous and planar Hall voltages and to quantify the perpendicular and in-plane components of magnetization. The sample with thicker Co layer (2.4 nm) showed an in-plane component of magnetization, whereas the sample with 0.75 nm Co showed no in-plane component. The high value of H ex observed in 0.75 nm Co samples can have important implications in spintronics and bit patterned media.

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Characterization of Coupled Novel Magnetic Multilayers With Anomalous Hall Effect

Cited by 7 publications

References 19 publications

Tunable resonant properties of perpendicular anisotropy [Co/Pd]/Fe/[Co/Pd] multilayers

Tunable resonant properties of perpendicular anisotropy [Co/Pd]/Fe/[Co/Pd] multilayers

Temperature and Co thickness dependent sign change of the anomalous Hall effect in Co/Pd multilayers: An experimental and theoretical study

Origin of anomalously high exchange field in antiferromagnetically coupled magnetic structures: Spin reorientation versus interface anisotropy

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