Journal of the Magnetics Society of Japan最新文献_第5页

Structural, Magnetic, and Electric Properties of Pt/Co/Au/Cr2O3/Pt Thin Film with Cr2O3 Layer below 25 nm 25 nm以下Cr2O3层Pt/Co/Au/Cr2O3/Pt薄膜的结构、磁性和电学性能

Journal of the Magnetics Society of Japan Pub Date : 2021-07-01 DOI: 10.3379/MSJMAG.2107R004

Y. Shiratsuchi, J. Shen, Y. Tao, K. Takahara, K. Toyoki, R. Nakatani

{"title":"Structural, Magnetic, and Electric Properties of Pt/Co/Au/Cr2O3/Pt Thin Film with Cr2O3 Layer below 25 nm","authors":"Y. Shiratsuchi, J. Shen, Y. Tao, K. Takahara, K. Toyoki, R. Nakatani","doi":"10.3379/MSJMAG.2107R004","DOIUrl":"https://doi.org/10.3379/MSJMAG.2107R004","url":null,"abstract":"Perpendicular exchange bias using magnetoelectric Cr 2 O 3 has an electric-field triggered switching ability, and the thickness limit of the Cr 2 O 3 layer for inducing this bias is a topic of research. In this paper, we investigated the structural, magnetic, and electric properties of Pt/Co/Au/Cr 2 O 3 /Pt thin films with a Cr 2 O 3 layer in the thickness range of 5.7 to 25 nm. By using a magnetron sputtering method, a well-crystallized Cr 2 O 3 (0001) layer was formed in 5.7-nm-thick Cr 2 O 3 . All studied films showed perpendicular magnetic anisotropy. The uniaxial magnetic anisotropy energy density increased as the Cr 2 O 3 thickness decreased, and 810±90 kJ/m 3 was obtained for the film with 5.7-nm-thick Cr 2 O 3 . Perpendicular exchange bias was evaluated above 80 K, and an exchange anisotropy energy density of 0.30 mJ/m 2 was observed for the film with a 25-nm-thick Cr 2 O 3 at 80 K. The exchange bias could not be observed below 18 nm. Instead, coercivity enhancement, which yields the exchange bias by precisely controlling interfacial exchange coupling, was observed. The electric resistivity was about 5  10 5  ·m for the 5.7-nm-thick Cr 2 O 3 layer, which is sufficiently high for magnetoelectric applications.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82484046","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}

引用次数: 0

Adjacent Track Interference in Three-Dimensional Heat-Assisted Magnetic Recording 三维热辅助磁记录中的相邻磁道干扰

Journal of the Magnetics Society of Japan Pub Date : 2021-07-01 DOI: 10.3379/MSJMAG.2107R003

T. Kobayashi, Y. Nakatani, Y. Fujiwara

引用次数: 1

Estimation of Magnetic Domain Size in Chiral Antiferromagnet Mn3Ir by the Anomalous Hall Measurements 用反常霍尔测量估计手性反铁磁体Mn3Ir的磁畴尺寸

Journal of the Magnetics Society of Japan Pub Date : 2021-07-01 DOI: 10.3379/MSJMAG.2107L002

Yuta Kobayashi, Tetsuya Ikebuchi, Y. Shiota, T. Ono, T. Moriyama

引用次数: 0

Perpendicular Anisotropy and Damping of MBE-grown MgO/Fe/Au(001) and Au/Fe/Au(001) Trilayers mbe生长MgO/Fe/Au(001)和Au/Fe/Au(001)三层的垂直各向异性和阻尼

Journal of the Magnetics Society of Japan Pub Date : 2021-07-01 DOI: 10.3379/MSJMAG.2107R005

N. Kamiya, D. Oshima, S. Iwata, T. Kato

引用次数: 1

A Novel Reluctance Network Model Applicable for Open Magnetic Circuits 一种适用于开路磁路的磁阻网络模型

Journal of the Magnetics Society of Japan Pub Date : 2021-07-01 DOI: 10.3379/MSJMAG.2107R006

Y. Hane, K. Sugahara, K. Nakamura

引用次数: 0

Void-Defect Induced Magnetism and Structure Change of Carbon Material-Ⅲ: Hydrocarbon Molecules 碳材料的空洞缺陷诱导磁性和结构变化-Ⅲ:碳氢化合物分子

Journal of the Magnetics Society of Japan Pub Date : 2021-04-20 DOI: 10.3379/msjmag.2107R014

N. Ota, Aigen Li, L. Nemes

{"title":"Void-Defect Induced Magnetism and Structure Change of Carbon Material-Ⅲ: Hydrocarbon Molecules","authors":"N. Ota, Aigen Li, L. Nemes","doi":"10.3379/msjmag.2107R014","DOIUrl":"https://doi.org/10.3379/msjmag.2107R014","url":null,"abstract":"Void-defect induced magnetism of graphene molecule was recently reported in our previous paper of this series study. This paper investigated the case of hydrogenated graphene molecule, in chemical term, polycyclic aromatic hydrocarbon (PAH). Molecular infrared spectrum obtained by density functional theory was compared with astronomical observation. Void-defect on PAH caused serious structure change. Typical example of C 23 H 12 had two carbon pentagon rings among hexagon networks. Stable spin state was non-magnetic singlet state. This is contrary to pure carbon case of C 23 , which show magnetic triplet state. It was discussed that Hydrogen played an important role to diminish magnetism by creating an SP3-bond among SP2-networks. Such a structure change affected molecular vibration and finally to photoemission spectrum in infrared region. The dication-C 23 H 12 showed featured bands at 3.2, 6.3, 7.7, 8.6, 11.2, and 12.7 micrometer. It was surprising that those calculated bands coincided well with astronomically observed bands in many planetary nebulae. To confirm our study, large size molecule of C 53 H 18 was studied. Calculation reproduced again similar astronomical bands. Also, small size molecule of C 12 H 8 showed good coincidence with the spectrum observed for young stars. This paper would be the first report to indicate the specific PAH in space.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78826248","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}

引用次数: 0

Void-Defect Induced Magnetism and Structure Change of Carbon Material-Ⅱ: Graphene Molecules 碳材料的空洞缺陷诱导磁性和结构变化-Ⅱ:石墨烯分子

Journal of the Magnetics Society of Japan Pub Date : 2021-03-01 DOI: 10.3379/MSJMAG.2103R007

N. Ota, Aigen Li, L. Nemes, M. Otsuka

{"title":"Void-Defect Induced Magnetism and Structure Change of Carbon Material-Ⅱ: Graphene Molecules","authors":"N. Ota, Aigen Li, L. Nemes, M. Otsuka","doi":"10.3379/MSJMAG.2103R007","DOIUrl":"https://doi.org/10.3379/MSJMAG.2103R007","url":null,"abstract":"Void-defect is a possible origin of ferromagnetic feature on pure carbon materials. In our previous paper, void-defect on graphene-nanoribbon show highly polarized spin configuration. In this paper, we studied cases for graphene molecules by quantum theory, by astronomical observation and by laboratory experiment. Model molecules for the density functional theory are graphene molecules of C23 and C53 induced by a void-defect. They have carbon pentagon ring within a hexagon network. Single void has three radical carbons, holding six spins. Those spins make several spin-states, which affects to molecular structure and molecular vibration, finally to infrared spectrum. The stable spin state was triplet, not singlet. This suggests magnetic pure carbon molecule. It was a surprise that those molecules show close infrared spectrum with astronomically observed one, especially observed on carbon rich planetary nebulae. We could assign major band at 18.9 micrometer, and sub-bands at 6.6, 7.0, 7.6, 8.1, 8.5, 9.0 and 17.4 micrometer. Also, calculated spectrum roughly coincides with that of laboratory experiment by the laser-induced carbon plasma, which is an analogy of cosmic carbon creation in interstellar space. [To be published on Journal of the Magnetics Society of Japan (2021), e-mail to Norio Ota: n-otajitaku@nifty.com ]","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"31 1","pages":"41-49"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78252325","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}

引用次数: 0

Anomalous Nernst and Seebeck Effects in NiCo2O4 Films NiCo2O4薄膜中的反常能思特和塞贝克效应

Journal of the Magnetics Society of Japan Pub Date : 2021-03-01 DOI: 10.3379/MSJMAG.2103R006

H. Koizumi, A. Hidaka, T. Komine, H. Yanagihara

引用次数: 1

Medium Layer Structure in Three-Dimensional Heat-Assisted Magnetic Recording 三维热辅助磁记录中的介质层结构

Journal of the Magnetics Society of Japan Pub Date : 2021-03-01 DOI: 10.3379/msjmag.2103r03

T. Kobayashi, Y. Nakatani, Y. Fujiwara

引用次数: 0

Void-Defect Induced Magnetism and Structure Change of Carbon Materials -Ⅰ: Graphene Nano Ribbon 碳材料的空洞缺陷诱导磁性和结构变化-Ⅰ:石墨烯纳米带

Journal of the Magnetics Society of Japan Pub Date : 2021-03-01 DOI: 10.3379/MSJMAG.2103R005

N. Ota, L. Nemes

{"title":"Void-Defect Induced Magnetism and Structure Change of Carbon Materials -Ⅰ: Graphene Nano Ribbon","authors":"N. Ota, L. Nemes","doi":"10.3379/MSJMAG.2103R005","DOIUrl":"https://doi.org/10.3379/MSJMAG.2103R005","url":null,"abstract":"Void-defect is a possible origin of ferromagnetic-like feature of pure carbon material. Applying density functional theory to void-defect induced graphene-nano-ribbon (GNR), a detailed relationship between multiple-spin-state and structure change was studied. An equilateral triangle of an initial void having six electrons is distorted to isosceles triangle by re-bonding carbon atoms. Among possible spin-states of Sz=0/2, 2/2, 4/2 and 6/2, the most stable state was Sz=2/2. The case of Sz=4/2 is remarkable that initial flat ribbon turned to three dimensionally curled one having highly polarized spin configuration at ribbon edges. Total energy of Sz=4/2 was very close to that of Sz=2/2, which suggests coexistence of flat ribbon and curled ribbon. As a model of three dimensional graphite, bi-layered AB stacked GNR was analyzed for cases of different void position of α-site and β-site. Spin distribution was limited to the surface layer, nothing to the back layer. Distorted void triangle show 60degree clockwise rotation from αto β-site, which was consistent with experimental observation using the scanning tunneling microscope. This study revealed that void-defect in GNR induces unusual polarized spin state, different with usual ferromagnetic one. [ To be published on Journal of the Magnetics Society of Japan (2021), e-mail to Norio Ota: n-otajitaku@nifty.com ]","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"39 1","pages":"30-36"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89652661","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}

引用次数: 0