Impact of Symmetry on Anisotropic Magnetoresistance in Textured Ferromagnetic Thin Films

Philippi-Kobs, André; Farhadi, A.; Matheis, L.; Lott, D.; Chuvilin, Andrey; Oepen, Hans Peter

doi:10.1103/physrevlett.123.137201

Cited by 26 publications

(21 citation statements)

References 75 publications

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“…The difference between the two estimated values may be ascribed to the ambiguity of fitting parameters such as P and λCo. In addition, other mechanisms including anomalous SMR which was reported in the Pt / Co bilayers [67] and anisotropic magnetoresistance in textured FM films [68], may also contribute to the observed SMR signal. Considering these points, we conclude that the present Cu95Ir5 possesses a relatively large θSH and a short λSD.…”

Section: Harmonic Hall Voltage Measurementsmentioning

confidence: 80%

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Masuda¹,

Seki²,

Lau³

et al. 2020

Phys. Rev. B

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Metallic superlattices where the magnetization vectors in the adjacent ferromagnetic layers are antiferromagnetically coupled by the interlayer exchange coupling through nonmagnetic spacer layers are systems available for the systematic study on antiferromagnetic (AF) spintronics. As a candidate of nonmagnetic spacer layer material exhibiting remarkable spin Hall effect, which is essential to achieve spin-orbit torque switching, we selected the Ir-doped Cu in this study.The AF-coupling for the Co / Cu95Ir5 / Co was investigated, and was compared with those for the Co / Cu / Co and Co / Ir / Co. The maximum magnitude of AF-coupling strength was obtained to be 0.39 mJ/m 2 at the Cu95Ir5 thickness of about 0.75 nm. Furthermore, we found a large spin Hall angle of Cu95Ir5 in Co / Cu95Ir5 bilayers by carrying out spin Hall magnetoresistance and harmonic Hall voltage measurements, which are estimated to be 3 ~ 4 %.Our experimental results clearly indicate that Cu95Ir5 is a nonmagnetic spacer layer allowing us to achieve moderately strong AF-coupling and to generate appreciable spin-orbit torque via the spin Hall effect.

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Section: Harmonic Hall Voltage Measurementsmentioning

confidence: 80%

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Masuda¹,

Seki²,

Lau³

et al. 2020

Phys. Rev. B

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“…72 There also exist several similar spindependent MR effects in SH/FM all-metallic heterostructures, such as the sizable SMR in samples with PMA 70,73 and unidirectional SMR (USMR) in samples with in-plane magnetic anisotropy. 74 However, the existence of the texture-dependent anisotropic interfacial magnetoresistance (AIMR) also needs to be carefully considered for a reasonable estimation of the SMR, as recently suggested by Philippi-Kobs et al 75…”

Section: Spin Hall Magnetoresistancementioning

confidence: 99%

Spin–orbit torque characterization in a nutshell

Nguyen¹,

Pai

2021

APL Materials

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Spin current and spin torque generation through the spin-orbit interactions in solids, of bulk or interfacial origin, are at the heart of spintronics research. The realization of spin-orbit torque (SOT) driven magnetic dynamics and switching in diverse magnetic heterostructures also paves the way for developing SOT magnetoresistive random access memory (SOT-MRAM) and other novel SOT memory and logic devices. Of scientific and technological importance are accurate and efficient SOT quantification techniques which have been abundantly developed in the last decade. In this article, we summarize popular techniques to experimentally quantify SOTs in magnetic heterostructures at micro-as well as nano-scale. For each technique, we give an overview of its principle, variations, strengths, shortcomings, error sources and any cautions in usage. Finally, we discuss the remaining challenges in understanding and quantifying the SOTs in heterostructures.I.

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“…The above equations are only valid for polycrystalline HM layers as it is the case for the standard Pt/YIG//YAG bilayer samples. For crystalline materials, the symmetry of the crystal has to be taken into account for the calculation of the resistivity tensor ρ [95][96][97]. For the inverted YIG/Pt//YAG bilayer sample types, we found that the Pt layer is weakly textured along the [111]-direction [see Fig.…”

Section: Magnetotransport Measurementsmentioning

confidence: 99%

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y3Fe5O12 and inverted
Geprägs
¹
,
Klewe
²
,
Meyer
³

et al. 2020
Phys. Rev. B
12
0
4
0
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The magnetic state of heavy metal Pt thin films in proximity to the ferrimagnetic insulator Y 3 Fe 5 O 12 has been investigated systematically by means of x-ray magnetic circular dichroism and x-ray resonant magnetic reflectivity measurements combined with angle-dependent magnetotransport studies. To reveal intermixing effects as the possible cause for induced magnetic moments in Pt, we compare thin film heterostructures with different orders of the layer stacking and different interface properties. For standard Pt layers on Y 3 Fe 5 O 12 thin films, we do not detect any static magnetic polarization in Pt. These samples show an angle-dependent magnetoresistance behavior, which is consistent with the established spin Hall magnetoresistance. In contrast, for the inverted layer sequence, Y 3 Fe 5 O 12 thin films grown on Pt layers, Pt displays a finite induced magnetic moment comparable to that of all-metallic Pt/Fe bilayers. This magnetic moment is found to originate from finite intermixing at the Y 3 Fe 5 O 12 /Pt interface. As a consequence, we found a complex angle-dependent magnetoresistance indicating a superposition of the spin Hall and the anisotropic magnetoresistance in these types of samples. Both effects can be disentangled from each other due to their different angle dependence and their characteristic temperature evolution.

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Impact of Symmetry on Anisotropic Magnetoresistance in Textured Ferromagnetic Thin Films

Cited by 26 publications

References 75 publications

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Spin–orbit torque characterization in a nutshell

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y3Fe5O12 and inverted
Geprägs
¹
,
Klewe
²
,
Meyer
³

et al. 2020
Phys. Rev. B
12
0
4
0
View full text Add to dashboard Cite

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Impact of Symmetry on Anisotropic Magnetoresistance in Textured Ferromagnetic Thin Films

Cited by 26 publications

References 75 publications

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer

Spin–orbit torque characterization in a nutshell

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y3Fe5O12 and inverted Geprägs1, Klewe2, Meyer3 et al. 2020Phys. Rev. B12040View full textAdd to dashboardCite

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Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y3Fe5O12 and inverted
Geprägs
¹
,
Klewe
²
,
Meyer
³

et al. 2020
Phys. Rev. B
12
0
4
0
View full text Add to dashboard Cite