Free-layer-thickness-dependence of the spin galvanic effect with spin rotation symmetry

Aljuaid, Wafa S.; Allen, Shane R.; Davidson, Angie; Fan, Xin

doi:10.1063/1.5048012

Cited by 12 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The other one is to employ the magnetic order. [14][15][16][17][18][19][20][21][22][23][24][25] The pure ferromagnet (FM) material can be naturally served as spin current source of the z-polarized spin current, [14,15] because the system symmetry can be broken by the FM magnetization. Even if neglecting intrinsic contributions to both SHE and Rashba effect, the z-polarized spin current in FM/nonmagnetic interface is still predicated due to the interface spin current effect, [16,17] and soon is observed in FM/light metal (LM) multilayers.…”

mentioning

confidence: 99%

“…Even if neglecting intrinsic contributions to both SHE and Rashba effect, the z-polarized spin current in FM/nonmagnetic interface is still predicated due to the interface spin current effect, [16,17] and soon is observed in FM/light metal (LM) multilayers. [18][19][20][21] Besides FM order, antiferromagnet (AFM) order can also be used to modulate the polarization of spin current based on the same reason, named magnetic SHE. [22] The z-polarized spin current has been observed, not only in non-collinear AFM with broken spin conservation, [23] but also in collinear AFM with spin conservation.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Generation and Detection of Dresselhaus‐Like Spin Current in a Single‐Crystal Ferromagnetic Metal

Wang

Yan

Cao

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Distinct from the existing spin–orbit torque devices to only generate Rashba‐like spin current, it is proposed to generate Dresselhaus‐like spin current based on a single‐crystal ferromagnetic metal. By employing the second harmonic Hall measurement, it is found that the second harmonic Hall signal in single‐crystal ferromagnet exhibits an antisymmetric angular dependence induced by Dresselhaus‐like spin current, opposite to the reported symmetric angular dependence induced by Rashba‐like spin current. Such anomalous Dresselhaus‐like spin current is further confirmed by the current‐induced shift of the hysteresis loop when the magnetic field is swept along the current direction. However, when the ferromagnetic metal exhibits amorphous crystal structure or polycrystal structure, the Dresselhaus‐like spin current is absent. This result complements the missing type of spin currents due to charge‐to‐spin conversion and benefits the formulation of comprehensive spin–orbit coupling mechanism, by considering additional broken symmetry caused by ferromagnetic order and the structure symmetry of the crystalline lattice.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Generation and Detection of Dresselhaus‐Like Spin Current in a Single‐Crystal Ferromagnetic Metal

Wang

Yan

Cao

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…6 10 . The reverse effect -the inverse transverse spin Hall effect with spin rotation -was also detected in the similar structure [68], as shown in Fig. 16(c-d).…”

Section: Experimental Observation Of Conversion Between Charge Currenmentioning

confidence: 52%

“…The effective coefficient 𝜃 for the transverse spin Hall effect with spin rotation was extrapolated to be 4.8 0.6 10 . The reverse effect -the inverse transverse spin Hall effect with spin rotation -was also detected in the similar structure [68], as shown in Fig. 16(c-d).…”

Section: Experimental Observation Of Conversion Between Charge Curren...mentioning

confidence: 52%

Perspectives of electrically generated spin currents in ferromagnetic materials

et al. 2020

Self Cite

View full text Add to dashboard Cite

Spin-orbit coupling enables charge currents to give rise to spin currents and vice versa, which has applications in non-volatile magnetic memories, miniature microwave oscillators, thermoelectric converters and Terahertz devices. In the past two decades, a considerable amount of research has focused on electrical spin current generation in different types of nonmagnetic materials. However, electrical spin current generation in ferromagnetic materials has only recently been actively investigated. Due to the additional symmetry breaking by the magnetization, ferromagnetic materials generate spin currents with different orientations of spin direction from those observed in nonmagnetic materials. Studies centered on ferromagnets where spin-orbit coupling plays an important role in transport open new possibilities to generate and detect spin currents. We summarize recent developments on this subject and discuss unanswered questions in this emerging field. paul.haney@nist.gov xin.fan@du.edu * These two authors contributed equally to the manuscript.1 Note that the physical mechanisms required to generate spin polarized current can depend on boundary conditions. If the boundary condition is that the current entering the system is unpolarized, then spin-flip scattering is necessary for polarizing the current. If the boundary condition only specifies the electric field at the system edge, then spin-dependent conductivities are sufficient to obtain spin-polarized current.

show abstract

“…For example, spin polarization generated by the anomalous or planar Hall effects need to cross a ferromagnetic/nonmagnetic interface at which spin filtering and spinorbit precession can occur [105,106]. We also note that there are interesting ways that spin direction and the direction of charge flow can be interchanged, effects again associated with spin-orbit coupling known as spin swapping [107] or spin rotation [108][109][110]. There are additionally ideas for generating such spin polarizations using antiferromagnets [111], chiral antiferromagnets [112], and non-collinear antiferromagnets, e.g.…”

Section: Open Scientific Questionsmentioning

confidence: 85%

A Perspective on Electrical Generation of Spin Current for Magnetic Random Access Memories

Safranski,

Sun,

Kent

2022

Preprint

View full text Add to dashboard Cite

Spin currents are used to write information in magnetic random access memory (MRAM) devices by switching the magnetization direction of one of the ferromagnetic electrodes of a magnetic tunnel junction (MTJ) nanopillar. Different physical mechanisms of conversion of charge current to spin current can be used in 2-terminal and 3-terminal device geometries. In 2-terminal devices, charge-to-spin conversion occurs by spin filtering in the MTJ's ferromagnetic electrodes and present day MRAM devices operate near the theoretically expected maximum charge-to-spin conversion efficiency. In 3-terminal devices, spin-orbit interactions in a channel material can also be used to generate large spin currents. In this perspective article, we discuss charge-to-spin conversion processes that can satisfy the requirements of MRAM technology. We emphasize the need to develop channel materials with larger charge-to-spin conversion efficiency-that can equal or exceed that produced by spin filtering-and spin currents with a spin polarization component perpendicular to the channel interface. This would enable high-performance devices based on sub-20 nm diameter perpendicularly magnetized MTJ nanopillars without need of a symmetry breaking field. We also discuss MRAM characteristics essential for CMOS integration. Finally, we identify critical research needs for charge-to-spin conversion measurements and metrics that can be used to optimize device channel materials and interface properties prior to full MTJ nanopillar device fabrication and characterization.

show abstract

Free-layer-thickness-dependence of the spin galvanic effect with spin rotation symmetry

Cited by 12 publications

References 30 publications

Generation and Detection of Dresselhaus‐Like Spin Current in a Single‐Crystal Ferromagnetic Metal

Generation and Detection of Dresselhaus‐Like Spin Current in a Single‐Crystal Ferromagnetic Metal

Perspectives of electrically generated spin currents in ferromagnetic materials

A Perspective on Electrical Generation of Spin Current for Magnetic Random Access Memories

Contact Info

Product

Resources

About