Imaging mechanisms of force detected FMR microscopy

Midzor, M.; Wigen, P. E.; Pelekhov, Denis V.; Chen, W.; Hammel, P. C.; Roukes, M. L.

doi:10.1063/1.372748

Cited by 48 publications

(32 citation statements)

References 8 publications

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“…Magnetization dynamics have been studied in such elements by various techniques. [1][2][3][4][5][6][7] Substantial effort has been made to study magnetization reversal in continuous films and small elements 8,9 but the coherence 10,11 of precessional switching and the origin of the damping 12,13 are the subject of continuing debate. Time-resolved magnetic images 14 show that precessional switching is incoherent even in a permalloy element that initially has uniform magnetization.…”

Section: Introductionmentioning

confidence: 99%

Imaging the dephasing of spin wave modes in a square thin film magnetic element

et al. 2004

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We have used time-resolved scanning Kerr effect microscopy to study dephasing of spin wave modes in a square Ni 81 Fe 19 element of 10 m width and 150 nm thickness. When a static magnetic field H was applied parallel to an edge of the square, demagnetized regions appeared at the edges orthogonal to the field. When H was applied along a diagonal, a demagnetized region appeared along the opposite diagonal. Time-resolved images of the out-of-plane magnetization component showed stripes that lie perpendicular to H and indicate the presence of spin wave modes with wave vector parallel to the static magnetization. The transient Kerr rotation was measured at different positions along an axis parallel to H, and the power spectra revealed a number of different modes. Micromagnetic simulations reproduce both the observed images and the mode frequencies. This study allows us to understand an anisotropic damping observed at the center of the square element in terms of dephasing of the resonant mode spectrum.

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Section: Introductionmentioning

confidence: 99%

Imaging the dephasing of spin wave modes in a square thin film magnetic element

et al. 2004

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“…As a consequence, the ferromagnetic dynamics are typically determined by sample dimensions and the concept of the "sensitive slice" presented earlier in the paper is not generally valid. However, our recent work [14] has shown that in the presence of a sufficiently strong probe magnetic field, the intensities of the ferromagnetic modes of the sample are strongly enhanced, indicating a local modification of the wavevector of magnetostatic modes selected by the probe tip. These results suggest that further increase of the probe field will enable the FMR modes to be determined by the probe field independent of sample geometry.…”

Section: Application Of Mrfm To Imaging Of Microscopic Ferromagnetsmentioning

confidence: 99%

“…We have recently demonstrated [14] the application of the MRFM to FMR imaging of micromagnetic systems. Spatially resolved FMR imaging presents a challenge for microscopic magnetic imaging because of the strong interaction between the electronic moments; this renders the resonance frequency a nonlocal function of the applied magnetic field.…”

Section: Application Of Mrfm To Imaging Of Microscopic Ferromagnetsmentioning

confidence: 99%

The magnetic-resonance force microscope: a new tool for high-resolution, 3-D, subsurface scanned probe imaging

et al. 2003

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“…YIG is a typical magnetic insulator [13][14][15][16][17][18] with excellent microwave properties, and thus has widely been used in magnonics and spintronics fields [2]. However, direct fabrication of YIG cantilevers has not been reported yet, * Electronic address: seo@imr.tohoku.ac.jp although magnetic control of cantilever properties is expected owing to the strong spontaneous magnetization of YIG.…”

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confidence: 99%

Fabrication and magnetic control of Y3Fe5O12 cantilevers

Seo

Harii

Takahashi

et al. 2017

Applied Physics Letters

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We have fabricated ferrite cantilevers in which their vibrational properties can be controlled by external magnetic fields. Submicron-scale cantilever structures were made from Y3Fe5O12 (YIG) films by physical etching combined with use of a focused ion beam milling technique. We found that the cantilevers exhibit two resonance modes which correspond to horizontal and vertical vibrations. Under external magnetic fields, the resonance frequency of the horizontal mode increases, while that of the vertical mode decreases, quantitatively consistent with our numerical simulation for magnetic forces. The changes in resonance frequencies with magnetic fields reach a few percent, showing that efficient magnetic control of resonance frequencies was achieved.Spin mechanics [1], which explores interplay between magnetism and mechanical motion, is a young research field emerging along with the advance in spintronics [2]. Classical examples of such phenomena are the Einsteinde Haas effect [3] and its inverse effect, the Barnett effect [4]. In the Einstein-de Haas effect, mechanical rotation is induced by transfer of angular momentum from magnetization to mechanical ones. To detect mechanical effects induced by spins, a cantilever structure provides one of the most suitable tools [5][6][7][8][9][10]. A cantilever is a long rigid plate of which one end is supported tightly but the other end can mount a load. Because of their high sensitivity [11,12], cheapness, and ease of fabrication in large areas, cantilever structures have been essential in spin mechanics [1,[5][6][7][8][9][10].In commercial devices e.g. micro-electro-mechanical systems (MEMS), cantilevers are mostly fabricated on silicon wafers. Silicon is the most common semiconducting material on the earth, and widely used as a base material in the semiconductor industry. Silicon cantilevers thereby have great advantage since nanofabrication techniques developed in the semiconductor industry can be harnessed effectively. However, recent development in state-of-the-art nanofabrication techniques such as a focused ion beam (FIB) method enables wide material choice as ingredients of cantilevers, such as magnetic, piezoelectric, and ferroelectric materials. Cantilevers made of such functional materials are promising for exploration of new features in minute cantilever devices.In this study, we have fabricated ferrimagnetic cantilevers using garnet ferrite Y 3 Fe 5 O 12 (YIG). YIG is a typical magnetic insulator [13][14][15][16][17][18] with excellent microwave properties, and thus has widely been used in magnonics and spintronics fields [2]. However, direct fabrication of YIG cantilevers has not been reported yet, * Electronic address: seo@imr.tohoku.ac.jp although magnetic control of cantilever properties is expected owing to the strong spontaneous magnetization of YIG. In addition to functionality as magnetic cantilevers, a marriage between MEMS technology and spintronics will acceralate the study of spin mechanics. As shown in the following, we successfully fabricated a Y...

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Imaging mechanisms of force detected FMR microscopy

Cited by 48 publications

References 8 publications

Imaging the dephasing of spin wave modes in a square thin film magnetic element

Imaging the dephasing of spin wave modes in a square thin film magnetic element

The magnetic-resonance force microscope: a new tool for high-resolution, 3-D, subsurface scanned probe imaging

Fabrication and magnetic control of Y3Fe5O12 cantilevers

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