Write heads with pole tip consisting of high-Bs FeCoAlO films

Ikeda, Shoji; Tagawa, I.; Uehara, Yoshio; Kubomiya, T.; Kane, J.; Kakehi, A.; Chikazawa, A.

doi:10.1109/tmag.2002.802664

Cited by 22 publications

(11 citation statements)

References 13 publications

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“…Similar to Ref. 11, an in-plane radial internal anisotropy field was observed in the M-H loop measurements, the magnitude of which ͑for films deposited at 0.55 kW͒ increased from ϳ15 to ϳ 50 Oe after annealing at 500°C for 40 min. The anisotropy is also evident from differences in the behavior of microstrips made at different orientations with respect to the radial direction.…”

Section: Experiments and Discussionsupporting

confidence: 83%

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High-resistivity nanogranular Co–Al–O films for high-frequency applications

Amiri

Zhuang

Schellevis

et al. 2007

Journal of Applied Physics

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This work presents a series of high-resistivity nanogranular Co-Al-O films with maximum resistivity of ϳ110 m⍀ cm. The films were deposited using pulsed dc reactive sputtering of a Co 72 Al 28 target in an oxygen/argon ambient. The samples were characterized by scanning electron microscopy ͑SEM͒, M-H loop measurements, and s-parameter measurements on microstrip transmission lines with Co-Al-O magnetic cores. The high-frequency magnetic permeability profile was extracted from the microstrip measurements. Reduction of deposition power resulted in resistivity enhancement, as well as reduction of coercivity and permeability. SEM images reveal an average grain size of ϳ80 nm for films with the highest resistivity.

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Section: Experiments and Discussionsupporting

confidence: 83%

“…[7][8][9][10][11] Nano/micro granular Ni-Fe films have been shown to yield high resistivities, 7 but this comes at the costs of a rather low permeability and poor control of granular nucleation during film deposition. Other granular films reported in the literature mostly consist of complicated processing involving nonconductive elements.…”

Section: Introductionmentioning

confidence: 99%

High-resistivity nanogranular Co–Al–O films for high-frequency applications

Amiri

Zhuang

Schellevis

et al. 2007

Journal of Applied Physics

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“…Much effort has been taken to introduce soft magnetic properties in FeCo thin films [2]- [4]. Additives have been considered to be an effective method because suitable additives can reduce the grain size or control the resistivity [5]. So far, additives that induce soft magnetic properties are AlO, N,etc [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…Additives have been considered to be an effective method because suitable additives can reduce the grain size or control the resistivity [5]. So far, additives that induce soft magnetic properties are AlO, N,etc [5], [6]. However, not all the additives can induce soft magnetic properties in FeCo thin films.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of FeCo Films Prepared by Co-Sputtering and Hydrogenous Gas Reactive Sputtering

Liu

Morisako

2008

IEEE Trans. Magn.

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In this experiment, we have added C into FeCo films by two kind of sputtering process, the first is the conventional process of cosputtering, the second is the introducing hydrogenous gas, (acetylene gas in this experiment). The crystallographic, microstructure , and magnetic properties of the films have been compared. Although nano-crystalline films, which have much lower coercivity according to the random anisotropy theory proposed by Herzer [7], can be prepared by both processes, magnetic properties of the films prepared by the two processes are different. Magnetic soft films are successfully prepared with coercivity about 1 Oe, saturation magnetization about 23.5 KG, and real part permeability as large as 1200-1500 in the frequency range up to 2.6 GHz. X-ray photoelectron spectroscopy results show films deposited without hydrogenous gas have oxygen contamination as high as 3 at%. Oxygen free films are found to be prepared with the introducing of acetylene gas during the sputtering process.Index Terms-high magnetic induction films, soft magnetic properties, FeCo, magnetic write head.

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“…As the Co concentration reaches 90%, CoFe films, having fcc structure and nearly zero magnetostriction, are typical materials for giant magnetoresistance (GMR) spin valves. Plenty of investigations have been conducted on these Co-Fe alloys because of their high magnetization and their uses in magnetic recording media [3][4][5][6][7][8] .…”

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confidence: 99%

The spin and orbital moment contributions of each element to macroscopic magnetization in Co0.9Fe0.1 films

Guo

Wang

et al. 2006

CHINESE SCI BULL

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Co-Fe alloy films have such properties as high saturation magnetization, high Curie temperature and low coercive force. It is of importance to study the origin of high saturation magnetization in these alloys. In this paper, we study the spin (m s ) and orbital moments (m o ) of Fe and Co in the Co 0.9 Fe 0.1 film by using X-ray magnetic circular dichroism (XMCD) and SQUID magnetometry. The m s and m o for Co are 1.58 and 0.31 μ B , and for Fe are 1.63 and 0.36 μ B respectively. The average magnetic moment (1.90 μ B ) determined by XMCD is in agreement with that obtained from SQUID measurements. The total magnetic moment ratio of Fe to Co is 10.5:89.5, while the ratio of the spin to orbital moment is 83.4:16.6. Considering the separation of the spin and orbital moment, an outcome of m Fe-spin : m Fe-orbit : m Co-spin : m Co-orbit = 8.6:1.9:74.8:14.7 is obtained.

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Write heads with pole tip consisting of high-Bs FeCoAlO films

Cited by 22 publications

References 13 publications

High-resistivity nanogranular Co–Al–O films for high-frequency applications

High-resistivity nanogranular Co–Al–O films for high-frequency applications

Magnetic Properties of FeCo Films Prepared by Co-Sputtering and Hydrogenous Gas Reactive Sputtering

The spin and orbital moment contributions of each element to macroscopic magnetization in Co0.9Fe0.1 films

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