Abstract
Magnetic properties and high-frequency impedance of nanocrystalline Fe73.5Si16.5B6Nb3Cu1 ribbons are studied in a high-temperature range of 300 to 723 K. The exchange-coupled state of nanocrystallites was found to be destructed at a temperature of about 530 K, which is substantially lower than the Curie temperature of the amorphous phase that is close to 635 K. It was found that, at an ac frequency of above 5 MHz, the marked magnetoimpedance effect (more than 50% for the magneoimpedance ratio in the case of complete impedance) is observed over the whole temperature range under study. This similar behavior can be essential in designing special-purpose magnetic field sensors intended for high-temperature applications.
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