Magnetic wire and box arrays (invited)

Maeda, Atsushi; Kume, Minoru; Ogura, Takashi; Kuroki, Kazuhiko; Yamada, Takashi; Nishikawa, Madoka; Harada, Yasoo

doi:10.1063/1.358162

Cited by 78 publications

(38 citation statements)

References 10 publications

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“…From the point of view of fundamental studies, both the size and the arrangement of these magnetic islands affect their magnetic properties to a large extend. The reduction of the dimensionality causes new physical phenomena to appear concerning, for example, the magnetization reversal in an island, compared to an infinite film [1]. The high potential for applications of patterned magnetic structures in high-density, low-noise magnetic storage media, magnetic sensors and in magnetic random access memory is obvious [2].…”

Section: Introductionmentioning

confidence: 99%

“…The high potential for applications of patterned magnetic structures in high-density, low-noise magnetic storage media, magnetic sensors and in magnetic random access memory is obvious [2]. Although static properties of patterned magnetic structures have been studied to some extend [1,3,4,5], highfrequency dynamic properties have been rarely investigated. As the fundamental excitations, we discuss spin waves in the islands.…”

Section: Introductionmentioning

confidence: 99%

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Inelastic light scattering in magnetic dots and wires

Demokritov

Hillebrands

1999

Journal of Magnetism and Magnetic Materials

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An overview of the current status of the study of spin wave excitations in arrays of magnetic dots and wires is given. We describe both the status of theory and recent inelastic light scattering experiments addressing the three most important issues: the modification of magnetic properties by patterning due to shape anisotropies, anisotropic coupling between magnetic islands, and the quantization of spin waves due to the inplane confinement of spin waves in islands.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inelastic light scattering in magnetic dots and wires

Demokritov

Hillebrands

1999

Journal of Magnetism and Magnetic Materials

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“…Laterally defined micron and sub-micron magnetic structures have received great attention because of the advances in lithographic and magnetic measurement techniques [1,2] as well as due to their potential for practical applications, for example, data storage devices [3]. Dramatic changes in magnetic properties such as coercivity, saturation that occur due to the change in lateral dimensions provide the main motivation for studying these devices.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias effects in ferromagnetic wires

Husain

Adeyeye

Wang

et al. 2003

Journal of Magnetism and Magnetic Materials

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We have investigated the exchange bias effect in micron-sized ferromagnetic wires made from Co and Ni 80 Fe 20 films. The wires were fabricated using optical lithography, metallization by sputtering and lift-off technique. Magnetotransport measurements were performed at temperatures ranging from 3 to 300 K. We observed marked changes in the magnetoresistance (MR) properties as the temperature is varied. At 300 K, the field at which the sharp peak occurs corresponding to the magnetization reversal of the Co wires is 167 Oe and is symmetrical about the origin. As the temperature was decreased to 3 K, we observed a shift in the peak positions of the MR characteristics for both the forward and reverse field sweeps corresponding to a loop shift of 582 Oe in the field axis. The asymmetric shift in the MR loops at low temperatures clearly indicates the exchange bias between ferromagnetic (Co) and antiferromagnetic parts (Co-oxide at the surfaces) from natural oxidation. Ni 80 Fe 20 wires of the same geometry showed similar effect with a low exchange bias field. The onset of exchange biasing effect is found to be 70 and 15 K for the Co and Ni 80 Fe 20 wires, respectively. A striking effect is the existence of exchange biasing effect from the sidewalls of the wires even when the wires were capped with Au film. r

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“…Although static properties and coupling phenomena in magnetic films patterned on the micron scale have been studied extensively [1,2,3,4], high-frequency dynamic properties of such films have been rarely investigated. On the other hand, the study of spin wave properties in conventional finite size systems is well established, such as the investigation of so-called Walker-modes in magnetic spheroids [5], and of dipolar-dominated surface modes (Damon-Eshbach modes) in finite-thickness slabs with infinite lateral dimensions [6].…”

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confidence: 99%

Lateral Quantization of Spin Waves in Micron Size Magnetic Wires

et al. 1998

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We report on the observation of quantized surface spin waves in periodic arrays of magnetic Ni 81 Fe 19 wires by means of Brillouin light scattering spectroscopy. At small wavevectors (q || ≅ 0 -0.9·10 5 cm -1 ) several discrete, dispersionless modes with a frequency splitting of up to 0.9 GHz were observed for the wavevector oriented perpendicular to the wires. From the frequencies of the modes and the wavevector interval, where each mode is observed, the modes are identified as dipole-exchange surface spin wave modes of the film with quantized wavevector values determined by the boundary conditions at the lateral edges of the wires. With increasing wavevector the separation of the modes becomes smaller, and the frequencies of the discrete modes converge to the dispersion of the dipole-exchange surface mode of a continuous film.Patterned magnetic films are attracting increasing interest due to their potential applications in magnetic storage devices and sensors. Although static properties and coupling phenomena in magnetic films patterned on the micron scale have been studied extensively [1,2,3,4], high-frequency dynamic properties of such films have been rarely investigated. On the other hand, the study of spin wave properties in conventional finite size systems is well established, such as the investigation of so-called Walker-modes in magnetic spheroids [5], and of dipolar-dominated surface modes (Damon-Eshbach modes) in finite-thickness slabs with infinite lateral dimensions [6]. For periodic, micron-sized magnetic structures such a study has been still lacking, likely due to the high requirements both concerning the sample quality and the performance of the Brillouin light scattering experiment to detect the rather weak spin wave signals. In this Letter we report on the observation of quantization of spin waves in an array of magnetic wires. The quantization effects are identified as being due to the finite width of the wires. The evolution of the Damon-Eshbach mode of a continuous film from the discrete eigenmode spectrum of the wires with increasing wavevector, i.e., with diminishing influence of the finite size effect, is demonstrated and quantitatively described by a model based on quantized dipoleexchange modes. We show that both the frequency values and the wavevector intervals, where these modes are observed, are in a good agreement with our proposed model. The samples are made of a 200 Å thick permalloy (Ni 81 Fe 19 ) film deposited in UHV onto a Si(111) substrate by means of e-beam evaporation. Patterning was performed using X-ray lithography. The patterning masks were fabricated by means of a JEOL 5D2U nanopattern generator at 50 keV. X-ray exposure was performed at the super-ACO facility (LURE, Orsay, France) using a negative resist with a lift-off process with Al coating and ion milling. Two samples with periodic arrays of wires with a wire width w=1.8 µm and distances between the centers of the wires, Λ, of 2.5 µm and 4 µm (i.e., wire separations of 0.7 µm and 2.2 µm) were prepared for the inv...

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Magnetic wire and box arrays (invited)

Abstract: A thin wire array and magnetic host structure with n 0Structural and magnetic study of submicronic single crystal cobalt box arrays

Cited by 78 publications

References 10 publications

Inelastic light scattering in magnetic dots and wires

Inelastic light scattering in magnetic dots and wires

Exchange bias effects in ferromagnetic wires

Lateral Quantization of Spin Waves in Micron Size Magnetic Wires

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