Academic Journal
Modulating spin current induced effective damping in β–W/Py heterostructures by a systematic variation in resistivity of the sputtered deposited β–W films
| العنوان: | Modulating spin current induced effective damping in β–W/Py heterostructures by a systematic variation in resistivity of the sputtered deposited β–W films |
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| المؤلفون: | Aon, Soumik, Pal, Sayani, Manna, Subhadip, Mitra, Chiranjib, Mitra, Partha |
| المساهمون: | The science and Engineering Research Board, The Department of Science and Technology, Ministry of Education of the Government of India |
| المصدر: | Physica Scripta ; volume 99, issue 6, page 065546 ; ISSN 0031-8949 1402-4896 |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2024 |
| الوصف: | Utilizing the spin-induced pumping from a ferromagnet (FM) into a heavy metal (HM) under the ferromagnetic resonance (FMR) condition, we report an enhancement in effective damping in β - W/Py bilayers by systematically varying resistivity ( ρ W ) of β -W films. Different resistivity ranging from 100 μ Ω-cm to 1400 μ Ω-cm with a thickness of 8 nm can be achieved by varying the argon pressure ( P Ar ) during the growth by the method of sputtering. The coefficient of effective damping α eff is observed to increase from 0.010 to 0.025 with ρ W , which can be modulated by P Ar . We observe a modest dependence of α eff on the sputtering power ( p S ) while keeping the P Ar constant. α eff dependence on both P Ar and p S suggests that there exists a strong correlation between α eff and ρ W . It is thus possible to utilize ρ W as a tuning parameter to regulate the α eff , which can be advantageous for faster magnetization dynamics switching. The thickness dependence study of Py in the aforementioned bilayers manifests a higher spin mixing conductance ( g eff ↑ ↓ ) which suggests a strong spin pumping from Py into the β -W layer. The effective spin current ( J S ( eff ) ) is also evaluated by considering the spin-back flow in this process. Intrinsic spin mixing conductance ( g W ↑ ↓ ) and spin diffusion length ( λ SD ) of β -W are additionally investigated using thickness variations in β -W. Furthermore, the low-temperature study in β -W/Py reveals an intriguing temperature dependence in α eff which is quite different from α b of single Py layer and the enhancement in α eff at low temperature can be attributed to the spin-induced pumping from Py layer into β -W. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| DOI: | 10.1088/1402-4896/ad48c4 |
| DOI: | 10.1088/1402-4896/ad48c4/pdf |
| الاتاحة: | http://dx.doi.org/10.1088/1402-4896/ad48c4 https://iopscience.iop.org/article/10.1088/1402-4896/ad48c4 https://iopscience.iop.org/article/10.1088/1402-4896/ad48c4/pdf |
| Rights: | https://iopscience.iop.org/page/copyright ; https://iopscience.iop.org/info/page/text-and-data-mining |
| رقم الانضمام: | edsbas.29A399C3 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1402-4896/ad48c4 |
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