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25 May 1998

Volume 72, Issue 21, pp. 2631-2766

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Paramagnetic and ferromagnetic resonance imaging with a tip-on-cantilever magnetic resonance force microscope

K. Wago, D. Botkin, C. S. Yannoni, and D. Rugar

Appl. Phys. Lett. 72, 2757 (1998); http://dx.doi.org/10.1063/1.121081 (3 pages) | Cited 29 times

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A magnetic resonance force microscope with a “tip-on-cantilever” configuration was used to compare imaging characteristics of paramagnetic and ferromagnetic samples. Three-dimensional electron paramagnetic resonance (EPR) imaging of diphenylpicrylhydrazil (DPPH) particles was accomplished by scanning the sample in two dimensions while stepping an external field. The EPR force map showed broad response reflecting the size and shape of the sample, allowing a three-dimensional real-space magnetization image to be successfully reconstructed. In contrast to the EPR case, ferromagnetic resonance imaging of a micron-scale yttrium iron garnet sample showed no significant line broadening despite the strong field gradient ( ∼ 10 G/μm). Two-dimensional force maps revealed spatial dependence of magnetostatic and magnetoelastic modes. © 1998 American Institute of Physics.
Show PACS
76.30.Pk Conduction electrons
75.50.Gg Ferrimagnetics
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.80.+q Magnetomechanical effects, magnetostriction
07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques

Magnetic properties of Fe films epitaxially grown on Cr/GaAs(100) by dc magnetron sputtering

Biao Li, J. R. Fermin, Antonio Azevedo, F. M. de Aguiar, and S. M. Rezende

Appl. Phys. Lett. 72, 2760 (1998); http://dx.doi.org/10.1063/1.121082 (3 pages) | Cited 10 times

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We report on the growth of single-crystal Fe films by magnetron sputtering onto GaAs substrates. In order to establish the epitaxial orientation with the substrate a 100 Å Cr buffer layer was rf sputtered. The crystalline and magnetic properties were studied by x-ray diffraction, ferromagnetic resonance, and Kerr effect magnetometry techniques. The θ-2θ x-ray measurements show that only the Fe (200) peak is present, and the rocking curve shows a full width half maximum of 2°. Ferromagnetic resonance lines exhibit a line width of about 30 Oe, and the in-plane resonance field as a function of the azimuth angle presents a fourfold symmetry with no induced anisotropy. The in-plane hard- and easy-axis magneto-optical hysteresis loop traces are consistent with the ferromagnetic resonance results. © 1998 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
78.20.Ls Magneto-optical effects
68.55.-a Thin film structure and morphology
81.15.Cd Deposition by sputtering
78.66.Bz Metals and metallic alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
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