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AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorSusumu Soeya
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Embodiments of the present invention provide a heat-assisted magnetic recording medium capable of overcoming contradiction between the thermal fluctuation resistance at RT and easy writing at high temperature, capable of making the change of the coercive force to temperature change abrupt just below the recording temperature, and capable of formation at low temperature, specific anisotropy axis orientation and granulation. According to one embodiment, on a substrate, a magnetic exchange coupling film formed by successively stacking a lower layer antiferromagnet film at high KAF of TB<TW and an upper layer ferromagnet film at high KF of TW<TC as a write/read layer, comprising an antiferromagnet so as to satisfy a relations: TB<<TN, TB<TC<TN and changing the coercive force to temperature characteristic stepwise at the temperature TB just below TB by utilizing the property of TB and TB<<TN [TW: recording temperature, TC: curie temperature, TN: Neel temperature, TB: blocking temperature, KF: crystal magnetic anisotropy energy constant of ferromagnet, KAF: crystal magnetic anisotropy energy constant of the antiferromagnet.
A heat-assisted magnetic recording medium having, on a substrate, a magnetic exchange coupling film formed by stacking a lower layer film comprising an antiferromagnet at high KAF and an upper layer film comprising a ferromagnet as a write/read layer at high KF, the antiferromagnet is constituted so as to satisfy a relation:
A heat-assisted magnetic recording medium having, on a substrate, a magnetic exchange coupling film formed by stacking a lower layer film comprising an antiferromagnet at high KAF of TB<TW and an upper layer film comprising a ferromagnet as a read/write layer at high KF of TW<TC, the antiferromagnet is constituted so as to satisfy a relation:
A magnetic storage apparatus including:
Dependencies are inferred from the claim text.