Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.225
J. Moon, Seong-Hyub Lee, Kitae Kim, Jung-Hyun Park, Jun-Young Chang, Ji-Sung Yu, S. Choe
{"title":"Method to Check Sample Reproducibility by Measuring Magnetic Domain Wall Motion in Perpendicular Magnetic Anisotropy Thin Films","authors":"J. Moon, Seong-Hyub Lee, Kitae Kim, Jung-Hyun Park, Jun-Young Chang, Ji-Sung Yu, S. Choe","doi":"10.4283/jkms.2021.31.5.225","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.225","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45643343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.257
D. Zheng, D. Ji, Sung Hoon Kim
{"title":"Research Trends of Fabrication and Applications of Magnetic Hydrogel","authors":"D. Zheng, D. Ji, Sung Hoon Kim","doi":"10.4283/jkms.2021.31.5.257","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.257","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44208158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.249
S. Shon, Bu-An Kim, H. Kwon, Jung-Goo Lee
{"title":"Magnetic Properties of Na-Dopped La-Base M-Type Sintered Ferrite Magnet","authors":"S. Shon, Bu-An Kim, H. Kwon, Jung-Goo Lee","doi":"10.4283/jkms.2021.31.5.249","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.249","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43953322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.208
San Ko, Geun-Hee Lee, Kab-Jin Kim, Byong‐Guk Park
{"title":"Spin Orbit Torque-Driven Magnetic Domain Wall Majority Gate","authors":"San Ko, Geun-Hee Lee, Kab-Jin Kim, Byong‐Guk Park","doi":"10.4283/jkms.2021.31.5.208","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.208","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41474394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.219
Jaehun Cho, June-Seo Kim, C. You
{"title":"Magnetization Dynamics Properties of Thickness-dependent Ni81Fe19 Thin Film","authors":"Jaehun Cho, June-Seo Kim, C. You","doi":"10.4283/jkms.2021.31.5.219","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.219","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48119183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.197
June-Seo Kim, Jaehun Cho
{"title":"Multiple Chiral Domain Wall Motions by Applying Transverse Magnetic Field Pulses","authors":"June-Seo Kim, Jaehun Cho","doi":"10.4283/jkms.2021.31.5.197","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.197","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48220698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.203
Jae-Hun Sim, Soong-Geun Je
We performed micromagnetic simulations on a multiple magnetic domain wall injector in a two-terminal device where a magnetic gradient is implanted at one end. In the magnetic gradient region, successive up-down magnetization is generated by the spin-orbit torque and, in turn, injected into the magnetic wire with a strong perpendicular magnetic anisotropy, resulting in multiple domain propagation. We found that the threshold current for the multiple domain injection is minimized when an effective magnetic anisotropy at the end becomes nearly zero. As the effective anisotropy becomes more negative, the threshold current increases with a magnetic anisotropy gradient because the gradient acts as a barrier to the domain injection. Our result provides design rules for the optimized magnetic anisotropy gradient for the multiple domain generation and injection.
{"title":"Multiple Magnetic Domain Wall Injector Driven by Spin-Orbit Torque in a Two-Terminal Device","authors":"Jae-Hun Sim, Soong-Geun Je","doi":"10.4283/jkms.2021.31.5.203","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.203","url":null,"abstract":"We performed micromagnetic simulations on a multiple magnetic domain wall injector in a two-terminal device where a magnetic gradient is implanted at one end. In the magnetic gradient region, successive up-down magnetization is generated by the spin-orbit torque and, in turn, injected into the magnetic wire with a strong perpendicular magnetic anisotropy, resulting in multiple domain propagation. We found that the threshold current for the multiple domain injection is minimized when an effective magnetic anisotropy at the end becomes nearly zero. As the effective anisotropy becomes more negative, the threshold current increases with a magnetic anisotropy gradient because the gradient acts as a barrier to the domain injection. Our result provides design rules for the optimized magnetic anisotropy gradient for the multiple domain generation and injection.","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49167460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.214
Kyoung‐Woong Moon
{"title":"How to Get a Switching Phase Diagram of Macrospins in One Step","authors":"Kyoung‐Woong Moon","doi":"10.4283/jkms.2021.31.5.214","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.214","url":null,"abstract":"","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41913150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.229
Jiwan Kim
We built ultrafast Sagnac interferometer to simultaneously measure the lattice and the spin dynamics. Although the pump-probe magneto-optical Kerr effect (MOKE) instrument is most widely used in Femtomagnetism to measure reflectivity and Kerr responses, it is considerably hard to analyze fundamental interactions of electron-spin or lattice-spin due to the complex nature of the reflectivity. The ultrafast Sagnac interferometer has the great advantage of obtaining the real and imaginary parts of MOKE as well as the reflectivity and the lattice displacement at the same time. Therefore, through the rigorous investigation of temporal sequences of electron, lattice, and spin systems, we expect this instrument to play an leading role in unraveling interaction mechanisms between systems.
{"title":"Instrumentation of Ultrafast Sagnac Interferometry for Simultaneous Detection of Lattice and Spin Dynamics","authors":"Jiwan Kim","doi":"10.4283/jkms.2021.31.5.229","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.229","url":null,"abstract":"We built ultrafast Sagnac interferometer to simultaneously measure the lattice and the spin dynamics. Although the pump-probe magneto-optical Kerr effect (MOKE) instrument is most widely used in Femtomagnetism to measure reflectivity and Kerr responses, it is considerably hard to analyze fundamental interactions of electron-spin or lattice-spin due to the complex nature of the reflectivity. The ultrafast Sagnac interferometer has the great advantage of obtaining the real and imaginary parts of MOKE as well as the reflectivity and the lattice displacement at the same time. Therefore, through the rigorous investigation of temporal sequences of electron, lattice, and spin systems, we expect this instrument to play an leading role in unraveling interaction mechanisms between systems.","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42842104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.4283/jkms.2021.31.5.236
Seung-Yun Lee, Hyeonkoo Han, Sang-Suk Lee
The average life expectancy of modern people is rapidly increasing due to the development of medicine. The shoulder thermotherapy device (STD) used as a home medical device is studied for the purpose of relieving muscle pain in the upper part of the human body. The peripheral blood flow velocity (PBFV) could be measured from the two waveforms obtained by simultaneously measuring the pulse waves obtained by using a Hall element clip-type pulsimeter in the radial artery of the wrist and a photo-plethysmography (PPG) in the finger. Two women in their 20s with normal blood pressure used the STD by twice per a week for 13 weeks and compared before, middle, and after treatment, the PBFV improved by 12% to 17%.
{"title":"The Characteristics of Peripheral Blood Flow Velocity Measured by a Semiconductor Hall Device Clip-Type Pulsimeter and PPG for the Effect of Shoulder Thermal Treatment","authors":"Seung-Yun Lee, Hyeonkoo Han, Sang-Suk Lee","doi":"10.4283/jkms.2021.31.5.236","DOIUrl":"https://doi.org/10.4283/jkms.2021.31.5.236","url":null,"abstract":"The average life expectancy of modern people is rapidly increasing due to the development of medicine. The shoulder thermotherapy device (STD) used as a home medical device is studied for the purpose of relieving muscle pain in the upper part of the human body. The peripheral blood flow velocity (PBFV) could be measured from the two waveforms obtained by simultaneously measuring the pulse waves obtained by using a Hall element clip-type pulsimeter in the radial artery of the wrist and a photo-plethysmography (PPG) in the finger. Two women in their 20s with normal blood pressure used the STD by twice per a week for 13 weeks and compared before, middle, and after treatment, the PBFV improved by 12% to 17%.","PeriodicalId":42623,"journal":{"name":"Journal of the Korean Magnetics Society","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41602815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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