• Journal of the Korean Magnetics Society
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• v.5 no.6
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• pp.968-973
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• 1995

In order to investigate the annealing effect for RF magnetron sputtered $Ni_{83}Fe_{17}$ thin films, we have studied the spin wave rehaviors by FMR after annealing the samples at $135^{\circ}C,\;225^{\circ}C$ in air and at $160^{\circ}C,\;220^{\circ}C,\;330^{\circ}C,\;390^{\circ}C\;and\;420^{\circ}C$ in argon gas for one hour respectively. In FMR spectra for the films annealed in argon gas and the assputtered film at perpendicular resonance, only odd numrer spin waves are observed. But even numrer spin waves are observed for the film annealed in air at $225^{\circ}C$ recause of the large difference retween both surface magnetic anisotropy. In the case of the sample annealed at $420^{\circ}C$ in argon gas, the spin waves are shifted toward high field, can due to the increase of saturation magnetization during annealing. The spacings retween the spin wave resonance fields are narrowed rapidly, this is thought that the magnetic homogeneity increased in the film after annealing at high temperature.

• Horticultural Science & Technology
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• v.30 no.5
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• pp.484-492
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• 2012

The present study aimed to investigate the effect of static magnetic field (SMF) on the growth and physiological characteristics of common indoor plant species. Five foliage plant species, Spathiphyllum spp., Ardisia pusilla DC., Syngonium podophyllum, Peperomia pereskiifolia, and Pilea cadierei were potted into plastic pot equipped with round type anisotropic sintered NdFeB permanent magnet inside the pot. The surface magnetic flux density of each magnet was 3,500 G. After 6 months of growth period, the biomass accumulations of Spathiphyllum, A. pusilla, and P. cadierei under SMF were statistically higher than those of controls. Tissue water content also increased under the influence of SMF in most species. The photosynthetic rate of Spathiphyllum under SMF significantly increased but other species showed no significant difference compared with control. Although there was no significant increase in the photosynthetic rates of A. pusilla, and P. cadierei, they showed remarkable increase in total fresh weight under SMF. This suggests that the demand of assimilates for normal metabolism could be decreased under magnetic influence and thereby biomass accumulation could be more favored. But this is not always true for all plant species because P. pereskiifolia in this experiment, showed no changes in both photosynthetic rate and biomass accumulation. Leaf nitrogen and chlorophyll contents were enhanced significantly in most plant species under influence of SMF. Chlorophyll a/b ratio also increased by SMF. Although there might be a limitation depending on plant species, these results suggest that long-term exposure to SMF might allow plant to have an enhanced acclimation capacity against environmental fluctuations and optimal application of SMF could increase the practical use of indoor plants such as an attempt to improve indoor air quality.