Effects of diamagnetic Ga dilution on the Faraday response of bismuth-doped iron garnet films

被引:2
|
作者
Garzarella, A. [1 ]
Shinn, M. A. [1 ]
Wu, Dong Ho [1 ]
机构
[1] Naval Res Lab, Washington, DC 20375 USA
关键词
FIELD; MAGNETIZATION;
D O I
10.1063/1.4953880
中图分类号
O59 [应用物理学];
学科分类号
摘要
In bismuth-doped iron garnets, diamagnetic dilution of Fe with Ga is a well-known method to increase the Faraday rotation response under externally applied magnetic fields. It is found, however, that while this method improves responsivity at larger field strengths, the responsivity under smaller fields (which are more typical in sensing applications) is generally unaffected by Ga doping. The data indicate that the low-field responsivity is limited by anomalous pinning effects in the rotational magnetization process of the ferromagnetic domains. To overcome this, a magnetic biasing technique was developed, which enhances responsivity by activating Barkhausen steps in the films to free the domains from their pinning sites.
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页数:3
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