CAJ | 학술논문

用氢氟酸去掉Co69.20Fe4.16Si12.35B10.77Cr3.42Mo0.1非晶玻璃包裹丝的玻璃层，获得了高纯度的Co基非晶丝，再对非晶细丝在空气或氢气保护中进行了退火处理，研究了退火过程中退火温度和退火时间对Co基非晶丝巨磁阻抗效应（GM I）的影响．研究发现，随着退火温度升高和退火时间加长， Co基非晶丝巨磁阻抗表现出非单调且非对称的变化，灵敏度随着退火温度的升高和退火时间的加长表现为先增大后减小的行为．在退火温度为673 K ，退火时间为9 h的条件下，磁阻抗的灵敏度最高，可达227％．分析指出氧化层和纳米晶芯层的耦合相互作用可能是Co基非晶丝软磁性能得到改善的主要原因．
용경불산거도Co69.20Fe4.16Si12.35B10.77Cr3.42Mo0.1비정파리포과사적파리층，획득료고순도적Co기비정사，재대비정세사재공기혹경기보호중진행료퇴화처리，연구료퇴화과정중퇴화온도화퇴화시간대Co기비정사거자조항효응（GM I）적영향．연구발현，수착퇴화온도승고화퇴화시간가장， Co기비정사거자조항표현출비단조차비대칭적변화，령민도수착퇴화온도적승고화퇴화시간적가장표현위선증대후감소적행위．재퇴화온도위673 K ，퇴화시간위9 h적조건하，자조항적령민도최고，가체227％．분석지출양화층화납미정심층적우합상호작용가능시Co기비정사연자성능득도개선적주요원인．
Co-based(Co69.20Fe4.16Si12.35B10.77Cr3.42Mo0.1)amorphous microwires with 40 μm in diameter and 10 μm in glass-coated thickness are prepared by Taylor method . Then , the glass coating layer is removed using diluted HF acid . The amorphous wires are annealed in open air or under H2 protection . The relationship between giant magneto-impedance effect and the annealing conditions is investigated . The results show that the GMI curves are asymmetric after annealing . GMI ratios firstly increase then decrease with inoreasing of the annealing temperature and time . The maximum of GMI sensitivity of 227% is obtained for the samples annealed at 673 K for 9 hours . The exchange coupling interaction between the oxide layer and crystalline core is responsible for the improvement of soft magnetic properties of the wires .