Time dependence of remanence coercivity and medium noise in obliquely evaporated Co films

Yamanaka, K.; Takayama, T.; Ogawa, Yoichi; Yano, Akira; Okuwaki, T.

doi:10.1016/0304-8853(94)01304-7

Cited by 51 publications

(5 citation statements)

References 14 publications

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“…And the activation volume of the 14-nm-thick magnetic layer, which is estimated to be 2 . 0~1 0 -'~ CC from the magnetic viscosity measurements [9], is very close to the value of a > (=2.5x1 0-l8 cc) determined from E M observation. Therefore, it is considered that the exchange coupling between crystal grains may be very weak and that each crystal grain of the tested media can be treated approximately as individual magnetic grain.…”

Section: Resultssupporting

confidence: 85%

Experimental study of thermal decay in high-density magnetic recording media

et al. 1997

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Absiract -The thermal decay of written bits in CoCrPt/CrTi thin film media for high density longitudinal magnetic recording is examined using a magnetoresistive head at room temperature. A decay in signal output over time is observed for the media with a thin magnetic layer less than about 14 nm thick and the media noise increases. The thermal stability factor Ku.V/k.T of these media is estimated to be less than about 100. The signal decay and noise increase are more serious at higher linear recording densities. These results are consistent with the results of a micromagnetic simulation taking into account the thermal aftereffects. These characteristics suggest that media with a large magnetic anisotropy constant Ku will be required to realize high storage densities of over 10 Gbhn'.

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Section: Resultssupporting

confidence: 85%

Experimental study of thermal decay in high-density magnetic recording media

et al. 1997

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“…The simplest device is the so-called "vertical spin valve" [25,57] in which two ferromagnetic electrodes prepared from materials with different coercitive forces are separated by the molecular compound layer [31,32] with an additional thin layer of the insulator [25,36,58] providing the detection of the tunneling magnetoresistance [59]. Nickel [39,45] and cobalt [25,32,35,58,60], which are appreciably different in coercitive force [61][62][63][64] and are popular in the area of molecular spintronics, were chosen as ferromagnetic electrodes for manufacturing vertical spin valve prototypes containing a layer of complex I as the corresponding molecular compound. This makes it possible to create a required configuration of the spintronic device with an opposite magnetization of the electrodes to provide spin filtration and, hence, magnetoresistance [25,28,59].…”

Section: Resultsmentioning

confidence: 99%

Iron(II) Clathrochelates in Molecular Spintronic Devices: A Vertical Spin Valve

2022

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The thermal sublimation of the known cage iron(II) complex (clathrochelate) gives thin films of this compound on various supports without violating its integrity as shown by electron spectroscopy. The spin state of the complex remains unchanged compared to the polycrystalline sample and solution. The first prototypes of molecular spintronic devices in the form of a vertical spin valve are prepared from the chosen iron(II) clathrochelate, and their electron transport properties are studied.

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“…The magnetic properties were measured using polar Kerr equipment (PKE) and a vibrating sample magnetometer (VSM). The activation volume V act, which corresponds to the coherent magnetic reversal volume in a medium, was determined by irreversible susceptibility measurements using the equation 5) , where H f is the fluctuation field, T is the absolute temperature, and k is Boltzmann's constant.…”

Section: Methodsmentioning

confidence: 99%

Oblique-incidence sputtering of Ru intermediate layer for decoupling of intergranular exchange in perpendicular recording media

Saito

Inoue

Takahashi

2011

Journal of Applied Physics

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During the Ru deposition process for granular type perpendicular magnetic recording media, both a reduction in the Ru intermediate layer thickness and lowering of sputtering gas pressure were successfully achieved by focusing on a self-shadowing effect. Oblique-incidence sputtering with a 60° incident angle under an Ar gas pressure of 0.6 Pa yielded (1) columnar Ru grains with a growth direction of 30° from the film normal, (2) c-plane sheet texture by epitaxial growth on the Pt underlayer, and (3) a flat envelope of the surface and a deep gap at grain boundaries. This change in the Ru structure significantly contributes to reducing exchange coupling among magnetic grains, especially in the initial growth region in an overlying granular medium.

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Time dependence of remanence coercivity and medium noise in obliquely evaporated Co films

Cited by 51 publications

References 14 publications

Experimental study of thermal decay in high-density magnetic recording media

Experimental study of thermal decay in high-density magnetic recording media

Iron(II) Clathrochelates in Molecular Spintronic Devices: A Vertical Spin Valve

Oblique-incidence sputtering of Ru intermediate layer for decoupling of intergranular exchange in perpendicular recording media

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