Experimentally tunable chiral spin transfer torque in domain wall motion
Domain walls (DWs) can be moved very efficiently with nanosecond long current pulses in perpendicularly magnetized Co/Ni/Co nanowires formed with platinum under- and over-layers due to a chiral spin torque mechanism. In these structures the DWs exhibit a chiral Néel structure that has been proposed...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2016-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/18/5/053027 |
| _version_ | 1827873648281649152 |
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| author | Kwang-Su Ryu See-Hun Yang Stuart Parkin |
| author_facet | Kwang-Su Ryu See-Hun Yang Stuart Parkin |
| author_sort | Kwang-Su Ryu |
| collection | DOAJ |
| description | Domain walls (DWs) can be moved very efficiently with nanosecond long current pulses in perpendicularly magnetized Co/Ni/Co nanowires formed with platinum under- and over-layers due to a chiral spin torque mechanism. In these structures the DWs exhibit a chiral Néel structure that has been proposed is set by a Dyzaloshinskii–Moriya exchange interaction (DMI) arising from the Pt/Co and Co/Pt interfaces. The strength of this interaction can be measured from the longitudinal field dependence of the current induced DW velocity. We show, thereby, that the magnitude and sign of the DMI is strongly dependent and monotonically changes as small changes in the thicknesses of the Co layers are made. However, due to the chiral nature of the DMI we show that the magnitude and sign of the DMI is determined by the difference between the respective DMI at the upper and lower interfaces, which compensate each other. Thus, we find that the DMI increases as the lower Co thickness is increased but decreases as the upper Co thickness is increased, changing sign in both cases. |
| first_indexed | 2024-03-12T16:40:06Z |
| format | Article |
| id | doaj.art-0897727d61804b2ead089f5867b42320 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:40:06Z |
| publishDate | 2016-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-0897727d61804b2ead089f5867b423202023-08-08T14:30:59ZengIOP PublishingNew Journal of Physics1367-26302016-01-0118505302710.1088/1367-2630/18/5/053027Experimentally tunable chiral spin transfer torque in domain wall motionKwang-Su Ryu0See-Hun Yang1Stuart Parkin2Department of Physics Education, Korea National University of Education , Cheongju, Chungbuk 28173, KoreaIBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USAIBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USADomain walls (DWs) can be moved very efficiently with nanosecond long current pulses in perpendicularly magnetized Co/Ni/Co nanowires formed with platinum under- and over-layers due to a chiral spin torque mechanism. In these structures the DWs exhibit a chiral Néel structure that has been proposed is set by a Dyzaloshinskii–Moriya exchange interaction (DMI) arising from the Pt/Co and Co/Pt interfaces. The strength of this interaction can be measured from the longitudinal field dependence of the current induced DW velocity. We show, thereby, that the magnitude and sign of the DMI is strongly dependent and monotonically changes as small changes in the thicknesses of the Co layers are made. However, due to the chiral nature of the DMI we show that the magnitude and sign of the DMI is determined by the difference between the respective DMI at the upper and lower interfaces, which compensate each other. Thus, we find that the DMI increases as the lower Co thickness is increased but decreases as the upper Co thickness is increased, changing sign in both cases.https://doi.org/10.1088/1367-2630/18/5/053027chiral spin torquespin hall effectdomain wall motion75.70.Tj75.76.+j75.78.Fg |
| spellingShingle | Kwang-Su Ryu See-Hun Yang Stuart Parkin Experimentally tunable chiral spin transfer torque in domain wall motion New Journal of Physics chiral spin torque spin hall effect domain wall motion 75.70.Tj 75.76.+j 75.78.Fg |
| title | Experimentally tunable chiral spin transfer torque in domain wall motion |
| title_full | Experimentally tunable chiral spin transfer torque in domain wall motion |
| title_fullStr | Experimentally tunable chiral spin transfer torque in domain wall motion |
| title_full_unstemmed | Experimentally tunable chiral spin transfer torque in domain wall motion |
| title_short | Experimentally tunable chiral spin transfer torque in domain wall motion |
| title_sort | experimentally tunable chiral spin transfer torque in domain wall motion |
| topic | chiral spin torque spin hall effect domain wall motion 75.70.Tj 75.76.+j 75.78.Fg |
| url | https://doi.org/10.1088/1367-2630/18/5/053027 |
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