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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic anomalies in single crystal Fe3O4 thin films : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6097-6099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe3O4 thin films were reactively sputtered onto 〈100〉 and 〈110〉 MgO substrates. X-ray diffraction data indicate single crystal Fe3O4 films under a tensile stress. Magnetization data show good agreement with bulk Fe3O4 for Ms, but also show the presence of a large anisotropy component manifest in the lack of saturation in fields up to 70 kOe. Conversion electron Mössbauer spectroscopy data taken at zero field also show good agreement with bulk Fe3O4 for the values of the hyperfine fields and isomer shifts of the two Fe3O4 sites, indicate good stoichiometry, but indicate the presence of a large anisotropy component randomizing the moments. In-plane torque measurements on 〈100〉 oriented Fe3O4 are consistent with bulk Fe3O4 magnetocrystalline anisotropy. However, in-plane torque measurements on 〈110〉 oriented Fe3O4 show the presence of a uniaxial anisotropy superimposed on the crystalline terms. This anisotropy, modeled as being due to the stress induced by epitaxy, changes the easy axis from the 〈111〉 directions to the 〈110〉 directions in the (110) plane. Since the directional dependence of the crystal and stress anisotropy are measurable the "large anisotropy'' component is considered to be random.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355472
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic coercivity measurements of antiferromagnetically coupled magnetic media layers (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2748-2750 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed dynamic coercivity measurements on a series of antiferromagnetically coupled (AFC) magnetic recording media utilizing a static write/read tester. The samples consist of two magnetic layers, which are antiferromagnetically coupled by a nonmagnetic layer. The investigated samples have a fixed top layer thickness and variable bottom layer thickness, such that the composite remanent magnetization thickness product (MRtAFC) varies over a large range, 0.17–0.30 memu/cm2. We find that the ratio between anisotropy energy and thermal energy (≡ stability ratio, C−1), and the intrinsic switching field H0 are, within the experimental error, constant for the series. This suggests that the top magnetic layer to first order determines the stability ratio of the AFC media and that MRtAFC can be varied over a large range without decreasing the stability or increasing the write field requirements. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1369391
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  • 3
    Electronic Resource
    Electronic Resource
    Antiferromagnetically coupled magnetic media layers for thermally stable high-density recording (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3806-3808 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a magnetic recording media composed of antiferromagnetically coupled (AFC) magnetic recording layers as an approach to extend areal densities of longitudinal media beyond the predicted superparamagnetic limit. The recording medium is made up of two ferromagnetic layers separated by a nonmagnetic layer whose thickness is tuned to couple the layers antiferromagnetically. For such a structure, the effective areal moment density (Mrt) of the composite structure is the difference between the ferromagnetic layers allowing the effective magnetic thickness to scale independently of the physical thickness of the media. Experimental realizations of AFC media demonstrate that thermally stable, low-Mrt media suitable for high-density recording can be achieved. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329868
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  • 4
    Electronic Resource
    Electronic Resource
    Interlayer coupling and magnetic reversal of antiferromagnetically coupled media (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 91-93 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We characterize the interlayer coupling and magnetic reversal of antiferromagnetically coupled recording layers. We show that the granular structure and reduced thickness values of the lower layer result in its reversal being strongly thermally activated at room temperature. We also find that the granular structure of the layers produces large dipolar fields which favor antiparallel alignment of the layer magnetizations. These dipolar fields overcome the ferromagnetic regions in the oscillatory coupling as a function of Ru thickness tRu, causing the interlayer coupling to be only antiferromagnetic for tRu〉5 Å. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431397
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  • 5
    Electronic Resource
    Electronic Resource
    Role of boron on grain sizes and magnetic correlation lengths in recording media as determined by soft x-ray scattering (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1234-1236 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the chemical grain sizes and magnetic correlation lengths in CoCr-based magnetic recording media films using resonant soft x-ray small-angle scattering. We find that the addition of boron, while leading to slightly smaller physical grains, dramatically reduces the magnetic correlation length. These results show that B additions effectively act to suppress intergranular magnetic exchange via segregation to the grain boundaries. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1448665
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