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  • 1
    Online Resource
    Online Resource
    Buffer layer dependence of magnetoresistance effects in Co2Fe0.4Mn0.6Si/MgO/Co50Fe50 tunnel junctions
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 5 ( 2018-05-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 5 ( 2018-05-01)
    Abstract: Buffer layer dependence of tunnel magnetoresistance (TMR) effects was investigated in Co2Fe0.4Mn0.6Si (CFMS)/MgO/Co50Fe50 magnetic tunnel junctions (MTJs). Pd, Ru and Cr were selected for the buffer layer materials, and MTJs with three different CFMS thicknesses (30, 5, and 0.8 nm) were fabricated. A maximum TMR ratio of 136% was observed in the Ru buffer layer sample with a 30-nm-thick CFMS layer. TMR ratios drastically degraded for the CFMS thickness of 0.8 nm, and the values were 26% for Cr buffer layer and less than 1% for Pd and Ru buffer layers. From the annealing temperature dependence of the TMR ratios, amounts of interdiffusion and effects from the lattice mismatch were discussed.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5007766
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 2
    Online Resource
    Online Resource
    Coverage and properties of a-SiNx hard disk overcoat
    AIP Publishing ; 2003
    In:  Journal of Applied Physics Vol. 93, No. 10 ( 2003-05-15), p. 8704-8706
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 93, No. 10 ( 2003-05-15), p. 8704-8706
    Abstract: Amorphous silicon nitride (a-SiNx) overcoats are deposited on magnetic disks by rf-reactive sputtering to study their coverage and properties. According to the x-ray photoelectron spectroscopy analysis, a-SiNx has a low coverage-limit of ∼10 Å compared with that of the reference a-CNx (∼20 Å). The lower coverage-limit of a-SiNx may be attributed to its high density of 3.2 g/cm3, which corresponds to 93% bulk density. By contrast, the density of diamond-like carbon is only 54% that of diamond. This is in agreement with the results of coverage simulation, which reveal that the film coverage thickness decreases by ∼3 Å per 10% increase in the relative density. Compared with 45 Å a-CNx coated disks, 15 Å a-SiNx coated disks have fewer pinhole defects and are more durable in the accelerated flyability test. The superior performance of a-SiNx disk overcoat may be attributed to its dense structure and high hardness (25 GPa).
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1543136
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Magnetic anisotropy of [Co2MnSi/Pd]n superlattice films prepared on MgO(001), (110), and (111) substrates
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 6 ( 2015-02-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 6 ( 2015-02-09)
    Abstract: Superlattice films with full-Heusler Co2MnSi (CMS) alloy and Pd layers prepared on Pd-buffered MgO(001), (110), and (111) substrates were investigated. Crystal orientation and epitaxial relationship of Pd and CMS layers were analyzed from x-ray diffraction, pole figure measurements, and transmission electron microscope observation. Formation of the L21-ordered structure in the CMS layers was confirmed by observation of CMS(111) diffraction. Perpendicular magnetic anisotropy (PMA) was obtained in the [CMS (0.6 nm)/Pd (2 nm)]6 superlattice film formed using MgO(111) substrates although other superlattice films prepared using MgO(001) and (110) substrates showed in-plane and iso tropic magnetic anisotropy, respectively. The perpendicular magnetic anisotropy energy constant K for the superlattice films prepared using MgO(111) substrate was estimated to be 2.3 Mergs/cm3, and an interfacial anisotropy constant Ki per one CMS-Pd interface in the superlattice films was estimated to be 0.16 ergs/cm2. Ki in superlattice films with various crystal orientations showed positive values, indicating that Pd/CMS interfaces had an ability to induce PMA regardless of their crystal orientation.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4907892
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Writing domains in nanowires using a spin torque oscillator
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 2 ( 2023-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 2 ( 2023-02-01)
    Abstract: Magnetic nanowires can be used to store information. There are various ways to write magnetic domains in nanowires, usually involving the use of an Oersted field. In this work the use of a spin torque oscillator to write domains in magnetic nanowires is investigated using micromagnetic modelling. It is shown that domains can be written using a lower magnetic field than if an Oersted field were used. Writing of multiple domains in a nanowire is also demonstrated.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/9.0000459
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    Epitaxially grown Cu2Sb-type MnGaGe films with large perpendicular magnetic anisotropy
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 116, No. 6 ( 2020-02-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 116, No. 6 ( 2020-02-10)
    Abstract: A perpendicularly magnetized film is essentially important for spintronics applications, such as spin-transfer-torque type magnetoresistive random access memories, STT-MRAMs, and large perpendicular anisotropy energy, Ku, with small saturation magnetization, Ms, is required for reducing the critical current for the STT induced magnetization switching phenomenon. In this study, an equiatomic intermetallic compound, MnGaGe, was investigated in epitaxially grown film samples. Perpendicularly magnetized films with an Ms value of about 260 emu/cm3 at 300 K were fabricated onto MgO (100) single crystal substrates. The maximum value of Ku was 8.1 × 106 erg/cm3 at room temperature. Microstructure analysis using a scanning transmission electron microscope atomically revealed the Cu2Sb type crystal structure in the film sample. First principles calculations were also carried out to discuss the electronic structure. Using the analysis of the projected density of states for 3d-orbitals, the hybridization of the 3d-orbitals was suggested as a possible factor for promoting magnetocrystalline anisotropy. The MnGaGe film with the large Ku and relatively small Ms would be potentially used for spintronics applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5140398
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Magnetic property control by using a composite template for dual-layered perpendicular media
    AIP Publishing ; 2003
    In:  Journal of Applied Physics Vol. 93, No. 10 ( 2003-05-15), p. 6769-6771
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 93, No. 10 ( 2003-05-15), p. 6769-6771
    Abstract: Thin composite template layers for dual-layered perpendicular media have been studied. By combining a thin amorphous layer and a thin NiAl seed-layer, thermally stable and low noise media have been realized simultaneously. By changing the thickness ratio of the top amorphous layer and the bottom seed-layer, the magnetic properties of the recording layer can be controlled without changing the magnetic spacing between the soft underlayer and the write pole. Magneto-optical Kerr effect, transmission electron microscopy, and spin-stand measurements were performed to investigate the influence of different composite templates on the recording properties. It will be shown that the composite template allows the optimization of thermal stability and media noise in perpendicular media. The thermal stability of the media was measured by signal decay measurement using a spinstand and dynamic coercivity measurements using the Kerr effect. The KuV/kBT values, as obtained by the latter method, are consistent with the signal decay data. Those results demonstrate that the presented dynamic coercivity measurement is a very useful method for evaluating the thermal stability of dual-layered perpendicular media.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1557816
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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