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首页> 外文期刊>Earth, planets and space: EPS >Magnetic alignment of nonmagnetic silicates caused by paramagnetic anisotropy: origin of polarization observed in planetary formation region
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Magnetic alignment of nonmagnetic silicates caused by paramagnetic anisotropy: origin of polarization observed in planetary formation region

机译：由顺磁各向异性引起的非磁性硅酸盐的磁对准：在行星形成区中观察到的极化起源

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Possible dust alignment in dense regions due to paramagnetic anisotropy ΔχPARA is discussed based on the results of a laboratory experiment on ortho-pyroxene grains containing a small amount of Fe2+ ions (1.8 mol%). Ortho-pyroxene has been detected in circum-stellar regions by infrared emission spectroscopy. Our experiment was performed at room temperature using He gas as the dispersing medium. Although the grains do not contain strong magnetic moments, alignment was achieved at low field strength (1 mol%; this increasing ΔχPARA is the cause of the above-mentioned alignment obtained at the low field strength. Based on our observations, we infer the field intensity needed to obtain partial dust alignment of sufficient size to explain the observed polarization in astrophysical environments. Due to temperature dependences caused by a Curie Law and a rotational Brownian motion, the field intensity required to cause the alignment is expected to decrease considerably at low-temperature conditions assumed for a proto-planetary disk. The results of our experiment performed at room temperature provide a technical basis to reproduce grain alignment under such temperature conditions.
机译：基于对含有少量Fe2 +离子（1.8 mol％）的邻-rox颗粒的实验室实验结果，讨论了由于顺磁各向异性ΔχPARA而导致的在密集区域中可能发生的粉尘排列。通过红外发射光谱法已经在恒星周围区域检测到了邻二甲苯。我们的实验是在室温下使用氦气作为分散介质进行的。尽管晶粒不包含强磁矩，但在低场强（1 mol％）下仍可实现取向;ΔχPARA的增加是上述在低场强下获得取向的原因。获得足够大小的部分尘埃对准所需的强度，以解释在天体物理环境中观测到的极化。由于居里定律和旋转布朗运动引起的温度依赖性，导致对准的所需场强预计在低照度下会大大降低。我们在室温下进行的实验结果为在这种温度条件下再现晶粒取向提供了技术基础。

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