简介:Aseriesofnanocompositethinfilms,composedofNd2Fe14Bandα-Fe,hasbeenpreparedbyDC-magnetronsputteringcombinedionbeamsputteringontoSi(100)substrates.Theeffectsofpostannealingonthemicrostructureandmagneticpropertiesof[NdFeB/α-Fe/NdFeB]-typethinfilmshavebeeninvestigated.TheX-raydiffraction(XRD)studyshowedthatannealingofthefilmsfor30minattemperatures550,600,650,700℃resultedintheappearanceofdiffractionpeaks,characteristicforNd2Fe14Btetragonalstructure,α-FeandNd2O3phases.TheinvestigationusingtheVibratingSampleMagnetometer(VSM)withamaximumappliedfieldof2Tindicatedthatwiththeincreaseoftheannealingtemperature,themagneticpropertiesofthemultilayerfilmswereimprovedandreachedpeakvalueat650℃(Hci=41.72kA·m-1,Mr/Ms=0.4,(BH)max=30.35kJ·m-3),afterwhichthemagneticpropertiesweredecreasedgreatly.Alongwiththeincreaseofthethicknessofα-FelayerfromTα-Fe>16nm,thecoercivityHci,saturationmagnetizationMs,andremanenceratioMr/Msalldeclined.AstheAtomicForceMicroscope(AFM)indicated,afterbeingannealedat650℃for30min,thesamplewasshowedfinesurfacemorphologywithgrainsize60nm≤dα-Fe≤80nmand100nm≤dNdFeB≤150nm.
简介:Chinatotallyexportednearly24,000tonsofNdFeBproductsduring2013,including18,825tonsofpermanentmagnet,valuedUSD1.34billionatanaveragepriceof71.4USD/kg;3,277tonsofNdFeBmagneticpowder,valuedUSD101millionatanaveragepriceof30.9USD/kg;1,334tonsofstripcastingribbon,withtotalexportvalueofUSD74millionatanaveragepriceof55.3USD/kg;and586
简介:Theyear2007witnessesthe24~(th)anniversaryoftheinventionofsinteredNdFeBmagnets.MagneticenergyproductofsinteredNdFeBmagnetshasbeenincreasedto474kJ/m~3(59.5MGO_e)fromprimary279kJ/m~3(35MGO_e)in1983.Globaloutputofsinteredmagnetshadrisentoaround50,000tonsin2006fromtessthan1tonin1983.Consideringtheproduction