Journal
PHYSICAL REVIEW B
Volume 103, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L020407
Keywords
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Funding
- JSPS KAKENHI [19K05258]
- Samsung Science and Technology Foundation [BA-1501-07, BA-1501-51]
- KISTI Supercomputing Center [KSC-2019-CRE-0063]
- [26103002]
- Grants-in-Aid for Scientific Research [19K05258] Funding Source: KAKEN
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The research demonstrates efficient torque generation without heavy elements in ferromagnetic metal/Cu/Al2O3 trilayers. The effective spin Hall conductivity in these structures can be one order of magnitude higher than heavy-metal based multilayers, suggesting a direction for magnetic nanodevices based on orbital angular momentum injection.
Efficient electrical generation of torque is desired to develop innovative magnetic nanodevices. The torque can be generated by charge to spin conversion of heavy-metal layers through their strong spin-orbit interaction followed by the injection of the converted spin into adjacent ferromagnetic layers. However heavy atomic elements indispensable for this torque generation scheme are often incompatible with device mass production processes. Here we demonstrate efficient torque generation without heavy elements in ferromagnetic metal/Cu/Al2O3 trilayers. Despite the absence of heavy elements, their effective spin Hall conductivity can be one order of magnitude larger than those of heavy-metal based multilayers. Properties of the measured torque deviate from those of the spin-injection induced torque and are consistent instead with a recently proposed torque mechanism based on orbital angular momentum injection. Our results demonstrate a direction for magnetic nanodevices based on the orbital angular momentum injection.
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