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FRAM并不会受到磁场影响。
给楼主分享一个铁电技术的资料:
http://www.ti.com/lit/ml/szzt014a/szzt014a.pdf
http://www.ramtron.com/files/tech_papers/Ferro_Tech_Brief.pdf
FRAM存储器不受磁场影响。下面是Ti官方的有关FRAM的FAQs,你可以参考一下
http://www.ti.com/ww/en/mcu/fram_ultra_low_power_embedded_memory/fram_mcu_faqs.htm#7