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>A soft magnetic underlayer with negative uniaxial magnetocrystalline anisotropy for suppression of spike noise and wide adjacent track erasure in perpendicular recording media
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A soft magnetic underlayer with negative uniaxial magnetocrystalline anisotropy for suppression of spike noise and wide adjacent track erasure in perpendicular recording media
The suppression of spike noise and wide adjacent track erasure (WATE) are important technical issues in the development of a perpendicular recording medium (PRM). As a solution to both of these problems, this paper presents a type of soft magnetic underlayer (SUL) with negative uniaxiai perpendicular magnetic anisotropy. The magnetic anisotropy is achieved by employing a material with negative uniaxiai magnetocrystaliine anisotropy (K_u~(grain)). WATE is suppressed in the SUL by realizing wide distribution of magnetic flux below the edge of the return yoke, while spike noise is eliminated by ensuring the formation of a Neel wall instead of a Bloch wall in SUL domains. CoIr with the disordered hcp structure is selected as a negative K_u~(grain) material, and c-plane-oriented CoIr films with various Ir contents are prepared for experimental evaluation. Among the films tested, the CoIr film with 22 at. percent Ir is found to provide the minimum K_u~(grain) value of - 6 X 10~6 ergs/cm~3. Under a field applied parallel to the film plane, this film exhibits soft magnetic properties, attributable to the high crystallographic symmetry of the c-plane sheet texture. A PRM fabricated using the CoIr SUL is confirmed to display substantially lower spike noise and WATE compared to conventional structures.
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机译:抑制尖峰噪声和宽相邻的轨道擦除(WATE)是开发垂直记录介质(PRM)的重要技术问题。作为对这两个问题的解决方案,本文呈现了一种具有负Uniaxiai垂直磁各向异性的软磁下层(SUL)。通过使用具有负UniaxiaI磁晶体晶体静脉内各向异性的材料(K_U〜(晶粒))来实现磁各向异性。通过在返回轭的边缘下方实现磁通量的广泛分布在苏中抑制了Wate,而通过确保在SUL结构域中的布朗壁形成棉壁而消除了尖峰噪声。选择具有无序HCP结构的益官被选为负K_U〜(晶粒)材料,并为实验评估制备具有各种红外含量的C面取向的二核胶片。在测试的薄膜中,具有22次的益官胶片。发现百分号IR提供最小K_U〜(晶粒)值 - 6 x 10〜6 ergs / cm〜3。在平行于薄膜平面施加的场下,该薄膜具有软磁特性,可归因于C面板纹理的高晶体对称性。与传统结构相比,确认使用CoIR SUL制造的PRM以显示基本上更低的尖峰噪声和发物。
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