Microwave absorption measurements using a broad-band meanderline approach

Tsai, C. C.; Choi, Jeongyong; Cho, Sunglae; Lee, S J; Sarma, Bimal K.; Thompson, Carol; Chernyashevskyy, O.; Nevirkovets, I. P.; Ketterson, J. B.

doi:10.1063/1.3070471

Cited by 22 publications

(15 citation statements)

References 19 publications

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“…17 Microwaves are sent through a meandering copper wire supported by an adjacent copper plate, the magnetic sample is pressed against this structure. The meanderline output is rectified by a RF diode detector and the resulting signal is detected.…”

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confidence: 99%

Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating

Sklenar¹,

Bhat

Tsai

et al. 2012

Appl. Phys. Lett.

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Articles you may be interested inReciprocal Damon-Eshbach-type spin wave excitation in a magnonic crystal due to tunable magnetic symmetry Appl. Phys. Lett. 102, 012403 (2013); 10.1063/1.4773522Spin wave resonance excitation in ferromagnetic films using planar waveguide structures A patterned square silver antidot lattice on a thin uniform permalloy film facilitates direct coupling of a quasi-uniform microwave field to short wavelength magnetic modes. The resulting modes are studied as a function of both the magnitude and orientation (relative to the symmetry axes of the array) of an in-plane, external DC magnetic field. The observed modes are identified as surface spin waves with wavelengths matching the Fourier components of the silver array. V C 2012 American Institute of Physics. [http://dx.

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confidence: 99%

Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating

Sklenar¹,

Bhat

Tsai

et al. 2012

Appl. Phys. Lett.

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“…[21][22][23][24][25][26][27] Employed radiation sources are either tunable microwave sources [21][22][23]26 or vector network analyzers. [21][22][23][24][25][26][27] Employed radiation sources are either tunable microwave sources [21][22][23]26 or vector network analyzers.…”

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Broadband electron spin resonance at 4–40 GHz and magnetic fields up to 10 T

Schlegel

Dressel

Slageren

2010

Review of Scientific Instruments

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A broadband electron spin resonance spectrometer is described which operates at frequencies between 4 and 40 GHz and can be used in superconducting magnets. A tunable cylindrical cavity is connected to a vector network analyzer via coaxial cables, and the radiation is fed into the cavity by a coupling loop. No field modulation is employed. Resonance frequencies below 14 GHz are obtained by inserting dielectrics with different permittivities into the cavity. The setup allows for measurements with the microwave magnetic field either parallel or perpendicular to the external field.

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“…The cell itself consisted of a copper housing with input and output microwave coax connectors and an internal chamber that housed the Si chip ͑on which the disk array was patterned͒ clamped adjacent to a copper wire wound meander line which generates the rf magnetic fields; details concerning the construction of the cell have been presented elsewhere. 15 The assembled cell was placed between the pole pieces of a 4Љ Varian electromagnet; the dc field was sensed with a Hall probe. The microwave signal was derived from a HP model 83623A synthesizer with a frequency range of 10-20 GHz and a maximum power output of 25 dBm.…”

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Vortex phase boundaries from ferromagnetic resonance measurements in a patterned disc array

et al. 2009

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Using a recently developed broadband microwave measurement technique, we have studied the hysteretic appearance and disappearance with in-plane magnetic field of the uniform ferromagnetic resonance ͑FMR͒ mode of a patterned permalloy disk array. The observed features are consistent with our micromagnetic simulations ͑performed on an infinite array of such disks͒, which predict that on decreasing the magnetic field from a positively magnetized state at positive fields the array will: ͑i͒ pass continuously into a double-vortex state; ͑ii͒ followed by a discontinuous transition to a single-vortex state; and finally ͑iii͒ discontinuously into a negatively magnetized state at some negative field. The hysteretic counterpart occurs on reversing the field sweep and returning to positive fields. The FMR data are consistent with the hysteretic dc magnetization measurements performed earlier on samples patterned in an identical manner.There has recently been much interest in measuring the ferromagnetic resonance ͑FMR͒ spectrum of patterned nanostructured magnetic arrays. As an early example, measurements on square permalloy ͑Py͒ disk arrays showed the presence of multiple absorption lines, the structure of which changed with the in-plane field angle, clear evidence of a disk-disk interaction. 1,2 Measurements have also been carried out on a wide variety of other structures such as rings, 3 holes, 4 ellipsoidal holes, 5 etc. Evolving in parallel have been micromagnetic strategies to calculate the FMR spectrum of nanostructures. Two approaches have proved popular both of which are based on representing nanostructures as discrete dipoles positioned on a lattice each one of which precesses under the influence of static and dynamic, homogeneous or inhomogeneous, external applied fields as well as internal fields arising from exchange, magnetic anisotropy, and the field produced by the remaining dipoles, all evolving according to the Landau-Lifshitz ͑LL͒ equation. In the first of these approaches one carries out a brute-force time integration of the coupled LL equations subject to some initial conditions. The widely used NIST OOMMF code is freely available for this task; 6 alternatively there is the RKMAG code. 7 The first approach is necessarily slow running and does not yield mode frequencies directly, which must be obtained by analyzing the response; 8 however it has the virtue of being able to handle the full nonlinear behavior. The second approach linearizes the equations of motion thereby yielding an eigenvalue problem from which all the mode frequencies emerge at once; 9 codes utilizing this approach are also freely available. 7 Using the eigenvectors of the associated matrix one can directly calculate the absorption spectrum for an arbitrary harmonic driving field. 10 The approach was recently generalized to treat the static and dynamic properties of periodic nanostructures. 11In disk and ring nanostructures the lowest-energy state is a vortex in which the local magnetization vectors lie on concentric circles in the plane...

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Microwave absorption measurements using a broad-band meanderline approach

Cited by 22 publications

References 19 publications

Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating

Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating

Broadband electron spin resonance at 4–40 GHz and magnetic fields up to 10 T

Vortex phase boundaries from ferromagnetic resonance measurements in a patterned disc array

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