Shape-induced ultrahigh magnetic anisotropy and ferromagnetic resonance frequency of micropatterned thin Permalloy films

Zhuang, Yan; Vroubel, M.; Rejaei, B.; Burghartz, Joachim N.; Attenborough, K.

doi:10.1063/1.2162067

Cited by 28 publications

(7 citation statements)

References 16 publications

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“…This is because the magnetic shape anisotropy due to the elongated shape of the magnetic films in the multilayer aligns the static magnetization parallel to the wire [8]. In our experiments, however, the excessive strain and stress in the multilayer deteriorated the magnetic alignment of the films, making the application of a bias field necessary.…”

Section: Resultsmentioning

confidence: 54%

Magnetic-Multilayered Interconnects Featuring Skin Effect Suppression

Zhuang

Rejaei

Schellevis

et al. 2008

IEEE Electron Device Lett.

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Abstract-A novel concept for a high-frequency, low-loss interconnect with significant skin effect suppression over a wide frequency band is presented. The concept is based on a multilayer comprising thin magnetic (Ni 80 Fe 20 ) and metal (Cu) layers. The negative permeability of the magnetic layers leads to a nearcancellation of the overall permeability of the multilayer stack. This results in a significant increase of skin depth and thus, a more uniform distribution of the current density and a dramatic reduction of loss within a certain frequency range. Coplanar waveguides built using the multilayer technology show more than 50% loss reduction at 14 GHz compared to their thick Cu-based counterparts.

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Section: Resultsmentioning

confidence: 54%

Magnetic-Multilayered Interconnects Featuring Skin Effect Suppression

Zhuang

Rejaei

Schellevis

et al. 2008

IEEE Electron Device Lett.

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“…the 240 nm array are higher than 10 GHz; the frequencies of the 500 nm array are around 8 GHz. These frequencies are significantly higher than 5.3 GHz, which was previously published for planar Py structure that used shape anisotropy for boosting the FMR frequency [8]. Fig.…”

Section: Experiments Setupmentioning

confidence: 73%

“…Among the materials that have been tested, permalloy (Py, Ni 80 Fe 20 ) films have attracted much attention. Nevertheless, only limited f r improvements have been demonstrated even though large aspect ratios were used [6][7][8][9][10]. No efforts have been made to control domain structures despite the fact that domain-wall motion and magnetization rotation are distinctly different.…”

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confidence: 99%

High-Frequency Properties of Permalloy Nanowire Arrays for RF Devices

Zhang

Song

Divan

et al. 2008

2008 8th IEEE Conference on Nanotechnology

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We present our simulation and experimental results on high-frequency properties of permalloy (Py) nanowire arrays. The planar Py nanowires are 10 μm long, 100 nm thick with widths of ~ 240 nm, and ~ 500 nm (layout dimension). The distance between adjacent Py nanowires is ~ 100 nm. OOMMF simulations indicate that single domain structures exist in these nanowires with ferromagnetic resonance frequencies (FMR) around 10 GHz. Coupling effects are negligible. The Oersted field of an external DC current reduces the FMR frequencies. The obtained Py properties can be used to simulate RF inductors to evaluate the application potentials of Py nanowire arrays in RF devices. I. BACKGROUNDIn the pursuit of on-chip high-performance radio-frequency (RF) devices, such as inductors [1-3], filters [4], and circulators [5], ferromagnetic materials have attracted much attention. The high-frequency permeability of the obtained ferromagnetic materials determines the effectiveness of performance boosting. For patterned ferromagnetic thin films, ferromagnetic resonance (FMR, frequency f r ) is often the main loss mechanism and application limiting factor. Therefore, boosting f r is of great interest.Exploiting shape anisotropy [4, 6, 7] of metallic ferromagnetic thin films is one of the promising approaches to boost f r . Among the materials that have been tested, permalloy (Py, Ni 80 Fe 20 ) films have attracted much attention. Nevertheless, only limited f r improvements have been demonstrated even though large aspect ratios were used [6][7][8][9][10]. No efforts have been made to control domain structures despite the fact that domain-wall motion and magnetization rotation are distinctly different. On the other hand, it was shown theoretically that Py structures can have 20 GHz or above FMR frequency [11]. It was also shown that Ni-Fe nanowires with small cross section areas have natural FMR frequencies around 20 GHz [12,13]. However, the fabrication processes are not compatible with CMOS process. Therefore, it is interesting to investigate the high frequency properties of planar submicron Py structures with controllable magnetization distributions.In a recent brief communication [14], we reported patterned submicron Py films with 8-10 GHz FMR frequencies. In this work, we present additional experimental results with simulation analyses of magnetization distributions, coupling effects, and Oersted field induced FMR frequency shift of permalloy nanowire arrays. With the obtained high-frequency permeability data, we also evaluate the potential of Py nanowire arrays for integrated inductor applications.

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“…Zhuang et al . obtained resonance frequency range of 1 to 5.3 GHz for the micropatterned FeNi films prepared by electroplating and lithography 17 . Han et al .…”

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confidence: 90%

“…The second is the stress anisotropy of the film, which can be used to yield tunable f r from 6.3 to 12.96 GHz 7 14 . The third is the shape anisotropy, such as patterned films with different strips 6 10 15 16 17 18 19 . The method works for materials either with or without strong magnetocrystalline anisotropy or stress anisotropy.…”

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confidence: 99%

Patterned FeNi soft magnetic strips film with tunable resonance frequency from 1 to 10.6 GHz

Ren

Yan

et al. 2016

Sci Rep

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Soft magnetic films with a wide-range tunable ferromagnetic resonance frequency are suitable for miniaturization and multifunctionalization of microwave integrated circuits. Fabrication of these films for high-frequency applications is usually complicated and difficult. We demonstrate a simple method to fabricate patterned FeNi soft magnetic strip films by magnetron sputtering and photolithography. Films prepared by this method exhibits a tunable in-plane uniaxial magnetic anisotropy (IPUMA) for different strip widths and gaps. As the strip widths changing from 500 to 2 μm, the IPUMA field increases monotonically from 2.2 to 576 Oe and resonance frequency from 1 to 10.6 GHz(which covers four microwave bands, including the L,S,C and X bands) respectively. This ultra-wide-range adjustability of resonance frequency can be attributed to shape anisotropy of strips. Considering that FeNi alloy has relatively low magnetocrystalline anisotropy, so a wider adjustable range of resonance frequency could be obtained using materials with stronger magnetocrystalline anisotropy.

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Shape-induced ultrahigh magnetic anisotropy and ferromagnetic resonance frequency of micropatterned thin Permalloy films

Cited by 28 publications

References 16 publications

Magnetic-Multilayered Interconnects Featuring Skin Effect Suppression

Magnetic-Multilayered Interconnects Featuring Skin Effect Suppression

High-Frequency Properties of Permalloy Nanowire Arrays for RF Devices

Patterned FeNi soft magnetic strips film with tunable resonance frequency from 1 to 10.6 GHz

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