Research Of Magnetic Properties Of Fe_73.5Cu₁Nb_3-xV_xSi_13.5B₉Nanocrystalline Strip And Its Magnetic Amplifier

With the development of modern electronic technology, switching power supplytechnology has been widely used in various electronic equipment.In thedcmultiplexed output switching power supply, magnetic amplifier used to adjust theoutput voltage has become a trend.Magnetic amplifier core square is as far as possible high in order to improve thecontrol sensitivity and amplification coefficient; Also material is required lowcoercive force and smalliron loss, which can reduce reset current and lower thetemperature rise of the system. In this paper soft magnetic properties of theFe73.5Cu1Nb3Si13.5B9nanocrystalline strip were studied in detail. By means ofannealing treatment and the longitudinal magnetic field treatment ofFe73.5Cu1Nb3Si13.5B9nanocrystalline strip, it achieves excellent magnetic such as highrectangle ratio, low coercive force, to be able to replace foreign products.In order to further reduce the piezomagnetic effect of Fe73.5Cu1Nb3Si13.5B9nanocrystalline strip, Fe73.5Cu1Nb3-xVxSi13.5B9nanocrystalline strip was prepared in thisarticle by means of adding sectional V instead of Nb in Fe73.5Cu1Nb3Si13.5B9nanocrystalline strip. When the x=1, Soft magnetic properties of Fe71.5Cu1Nb3V2Si13.5B9nanocrystalline is close to that of Fe73.5Cu1Nb3Si13.5B9nanocrystalline strip.Research of piezomagnetic effect shows that stress impedance effect value SI ofthe Fe71.5Cu1Nb3V2Si13.5B9nanocrystalline strip decreases with the increasingfrequency of testing signal. Joining V element will reduce the SI value of strip, suchas under the1KHz and1.55MPa, the SI value of amorphous strip excluding Velements of is0.29%, the SI value of amorphous strip including the highest V contentdecreases to0.24%. In0.76~1.55MPa stress range, the pressure magnetic propertiesof nano amorphous strips are generally better than that of amorphous strip. Innanocrystalline strip, magnetic properties of strip not joining V element are improvedin each frequency of the0.76~1.55MPa comparing to its amorphous, which the SIvalue reaches0.3%under1KHz and1.55MPa. In the joined V element strips,pressure magnetic properties of nanocrystalline strip are superior to its amorphousstrip in each frequency of the stress range of0.32~0.66MPa.