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  • 1
    facet.materialart.
    Unknown
    Effect of crystallographical and geometrical changes of a ferrite head on magnetic signals during the sliding process with magnetic tape (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper reviews changes in the crystalline structure and geometry of lapped Mn-Zn ferrite heads in sliding contact with magnetic tape and the effects of these changes on magnetic signals. A highly textured, polycrystalline structure was produced on the surface of a single-crystal Mn-Zn ferrite head when it was finished with an aluminum oxide lapping tape. Sliding this lapped surface against a magnetic tape produced a nearly amorphous structure. The sliding process led to a degradation in readback signal of 1 to 2 dB (short-wavelength recording). Furthermore, wear of the magnetic head caused geometrical changes in the head surface. The signal read back with the worn magnetic head was sensitive to operating parameters such as head displacement and tape tension. A change in operating parameters created head-to-tape spacings and, consequently, excessive gains or losses in the readback signal.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87277 , E-2955 , NAS 1.15:87277 , Joint Tribology Conference; Oct 19, 1986 - Oct 22, 1986; Pittsburgh, PA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Effects of wear on structure-sensitive magnetic properties of ceramic ferrite in contact with magnetic tape (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Wear experiments and electron microscopy and diffraction studies were conducted to examine the wear and deformed layers in single-crystal Mn-Zn (ceramic) ferrite magnetic head material in contact with magnetic tape and the effects of that contact on magnetic properties. The crystalline state of the single-crystal magnetic head was changed drastically during the sliding process. A nearly amorphous structure was produced on its wear surface. Deformation in the surficial layer of the magnetic head was a critical factor in readback signal loss above 2.5 dB. The signal output level was reduced as applied normal load was increased. Considerable plastic flow occurred on the magnetic tape surface with sliding, and the signal loss due to the tape wear was approximately 1 dB.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87007 , E-2483 , NAS 1.15:87007 , Tribology Conf.,; Oct 08, 1985 - Oct 10, 1985; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Abrasion and deformed layer formation of manganese-zinc ferrite in sliding contact with lapping tapes (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Wear experiments were conducted using replication electron microscopy and reflection electron diffraction to study abrasion and the deformed layers produced in single-crystal Mn-Zn ferrite simulated heads during contact with lapping tapes. The crystaline state of the head is changed drastically during the abrasion process. Crystalline states ranging from nearly amorphous to highly textured polycrystalline can be produced on the wear surface of a single-crystal Mn-Zn ferrite head. The total thickness of the deformed layer was approximately 0.8 microns. This thickness increased as the load and abrasive grit size increased. The anisotropic wear of the ferrite was found to be inversely proportional to the hardness of the wear surface. The wear was lower in the order 211 111 10 0110. The wear of the ferrite increased markedly with an increase in sliding velocity and abrasive grit size.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87249 , E-2891 , NAS 1.15:87249 , ASME/ASLE Tribology Conference; Oct 19, 1986 - Oct 22, 1986; Pittsburgh, PA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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