CN110607503B - 一种高频磁芯用软磁复合膜及其制备方法 - Google Patents
一种高频磁芯用软磁复合膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种高频磁芯用软磁复合膜,属于软磁薄膜技术领域,其化学组成为[(Ni100‑ xFex)100‑y(SiO2)y/SiO2]n,其结构为:包括基片,所述基片上沉积有3‑5个薄膜单元,所述薄膜单元由颗粒膜层和所述颗粒膜层之上的SiO2薄膜层组成,还公开了其制备方法;本发明的复合膜同时具有下述性能:优良的软磁性能:饱和磁化强度4πMs≥9000Gs、各向异性场Hk:40‑80Oe,具有优良的高频性能:截止频率fr≥1GHz、磁导率实部(100MHz下)μr≥100,具有较高的电阻率:ρ≥4000μΩ·cm,单轴各向异性方向平行膜面,这有利于增加薄膜电感的感值稳定性和抗直流偏置能力,是一种应用于高频薄膜电感中的理想材料。
Description
技术领域
本发明涉及软磁薄膜技术领域,尤其涉及一种高频磁芯用软磁复合膜及其制备方法。
背景技术
随着电子通信系统向着高频段、小型化、集成化的发展,相关电子元器件对其支撑材料也提出了新的要求。对于应用在高频领域的薄膜电感,它对磁芯材料有四方面的要求:
1:薄膜磁芯需要具备高饱和磁化强度,这有利于提高起始磁导率,降低矫顽力;
2:还需要适中的各向异性场,提高各向异性场有利于提高材料的截止频率,但是,过高的各向异性场也会导致起始磁导率降低,所以需要一个适中的值;
3:另外,还需要高电阻率,这有利于降低涡流损耗。
4:最后,薄膜的单轴各向异性方向应平行膜面,以利于增加薄膜电感的感值稳定性和抗直流偏置能力。
而目前,公开文献中还没有能够同时满足上述要求的薄膜。比如,现有技术中,已经报道了各种磁性金属与氧化物组成的各类单层颗粒膜,如:FeCo-SiO2、NiFe-NZFO等材料,但是,仅仅是这些单层颗粒膜,并不能同时满足上述需求,比如涡流损耗较大、磁膜厚度超过200nm后的垂直各向异性较高。又比如,现有技术中报道了一种NiFe/Al2O3磁芯膜,但是,NiFe合金共振频率低,这导致了其高频(≥100MHz)损耗较大,品质因数小于2。
发明内容
本发明的目的之一,就在于提供一种高频磁芯用软磁复合膜,以解决上述问题。
为了实现上述目的,本发明采用的技术方案是这样的:一种高频磁芯用软磁复合膜,包括基片,所述基片上沉积有3-5个薄膜单元,所述基片可以是Si基片、GaN基片等等;
所述薄膜单元由颗粒膜层和所述颗粒膜层之上的SiO2薄膜层组成;其结构如图1所示。
所述颗粒膜层是由镍铁合金与SiO2复合而成,其化学组成为:(Ni100-xFex)100-y(SiO2)y,其中,x=35-60,y=15-30。
本发明的发明人通过大量试验,一方面采用合适的镍铁与二氧化硅复合,明显提高了材料的截止频率,另一方面,采用复合颗粒膜与二氧化硅叠层,相互协同,降低了磁膜的垂直各向异性和抑制涡流损耗。
尤其是,本发明的复合膜,同时具备颗粒膜高截止频率(大于1GHZ)和多层膜结构降低垂直各向异性这两个特点。
本发明的目的之二,在于提供一种上述的高频磁芯用软磁复合膜的制备方法,采用的技术方案为,包括以下步骤:
1)制备溅射用SiO2-Ni100-xFex复合靶;
2)清洗衬底基片,装入磁控溅射台;
3)沉积第一层(Ni100-xFex)100-y(SiO2)y颗粒膜;
4)沉积第二层SiO2薄膜;
5)重复3)与4)中的步骤,以制备[(Ni100-xFex)100-y(SiO2)y/SiO2]单元;
6)从磁控溅射台取出基片;
7)退火,即得。
作为优选的技术方案,其步骤为:
1)溅射靶材采用高纯度的SiO2-Ni100-xFex复合靶结构,边长10mm、厚度0.5mm的SiO2片子用导电银胶对称的粘贴于2英寸Ni100-xFex靶的刻蚀轨道位置,SiO2片子数量为1-4,SiO2片子的数量越多,Ni100-xFe与SiO2的成分比越小,也可通过x值的大小调节镍铁合金靶材的磁性能,x为35-60,准备完毕后装入磁控溅射台阴极,如图4所示;
2)用去离子水、丙酮、酒精超声清洗衬底基片,用氮气吹干得到样品,在环境温度:16-28℃;环境湿度:<61%RH的条件下将样品装入样品托,送入磁控溅射台,沉积室中夹持基片的夹具两端需有永磁体,以提供平行于基片表面的磁场,用于在薄膜沉积中感生出面内单轴各向异性场;
3)将溅射室真空度抽至5×10-5Pa,向溅射室通入Ar气,溅射气压调整到0.5-1Pa。打开射频电源,控制SiO2-Ni100-xFex复合靶的射频溅射功率为100-200W,起辉。待辉光稳定后,调节工作气压为0.15Pa-0.3Pa,预溅射1-5分钟,去除复合靶的表面杂质。预溅射完毕后,打开挡板,开始沉积第一层(Ni100-xFex)1-y(SiO2)y颗粒膜,溅射时间为5-30分钟,膜厚为150-250nm,溅射时基片不加热;
4)当(Ni100-xFex)1-y(SiO2)y颗粒膜沉积完毕后,关闭挡板,射频电源,将溅射气压调整到1.5-2.5Pa,打开射频电源,控制SiO2靶的射频溅射功率为100-200W,起辉。待辉光稳定后,调节工作气压为1.5Pa-2Pa,预溅射1-5分钟,去除SiO2靶的表面杂质。预溅射完毕后,打开挡板,开始沉积第二层SiO2薄膜,溅射时间为1-5分钟,膜厚为15-25nm,溅射时基片不加热;
5)重复3)与4)中的步骤3-5次以制备(Ni100-xFex)1-y(SiO2)y颗粒膜与SiO2薄膜组成的[(Ni100-xFex)100-y(SiO2)y/SiO2]单元;
6)溅射完毕后,关闭挡板,射频电源,Ar气阀,将基片由成膜室传出至预真空室,给预真空室充气,从磁控溅射台取出基片;
7)用N2气清洁基片,放入坩埚,在压强低于5×10-4Pa的真空退火炉中进行150-350℃的高温退火处理,保温时间为15-30分钟,退火时所加的磁场大小为4000-6000Oe,方向和溅射时施加的沿薄膜表面的磁场方向一致,退火完毕后取出基片,即得。
与现有技术相比,本发明的优点在于:本发明的复合膜是应用于高频薄膜电感中的理想材料,其理由基于:
1)具有优良的软磁性能:饱和磁化强度4πMs≥9000Gs、各向异性场Hk:40-80Oe,如图2所示;
2)具有优良的高频性能:截止频率fr≥1GHz、磁导率实部(100MHz下)μr≥100,如图3所示;
3)具有较高的电阻率:ρ≥4000μΩ·cm,这有利于降低高频下的涡流损耗;
4)它的单轴各向异性方向平行膜面,这有利于增加薄膜电感的感值稳定性和抗直流偏置能力。
附图说明
图1为本发明的高频磁芯用软磁复合膜的结构示意图;
图2为本发明的高频磁芯用软磁复合膜的M-H曲线;
图3为本发明的高频磁芯用软磁复合膜的磁谱;
图4为本发明的SiO2-Ni100-xFex复合靶示意图;
图中,1、基片;2、(Ni100-xFex)100-y(SiO2)y颗粒膜层;3、SiO2薄膜层。
具体实施方式
下面将结合附图对本发明作进一步说明。
实施例1
一种高频磁芯用软磁复合膜,其化学通式为:[(Ni45Fe55)80(SiO2)20/SiO2]3,其制备方法为,包括以下步骤:
1)准备SiO2-Ni45Fe55溅射靶材,SiO2片子数量为3,溅射的衬底基片为Si基片,装片时的环境条件为温度:22℃,湿度:55%RH;
2)溅射时SiO2-Ni45Fe55复合靶的射频溅射功率为150W,起辉气压为0.5Pa,工作气压为0.17Pa,预溅射时间为3分钟,溅射时间为20分钟,该条件下沉积出膜厚为200nm的(Ni45Fe55)80(SiO2)20颗粒膜;
3)SiO2靶的射频溅射功率为150W,起辉气压为2Pa,工作气压为1.9Pa,预溅射时间为3分钟,溅射时间为2分钟,该条件下沉积出膜厚为20nm的SiO2薄膜;
4)重复上述溅射步骤3次得到[(Ni45Fe55)80(SiO2)20/SiO2]3复合膜;
5)高温退火处理的压强为4×10-4Pa,退火温度为200℃,保温时间为20分钟,退火时所加的磁场大小为5000Oe。
上述工艺条件下获得的[(Ni45Fe55)80(SiO2)20/SiO2]3复合膜厚度为660nm、4πMs=10300Gs、Hk=65Oe、fr=1.9GHz、μr(100MHz)=238、ρ=4100μΩ·cm、单轴各向异性方向平行膜面。
实施例2
一种高频磁芯用软磁复合膜,其化学通式为:[(Ni50Fe50)79(SiO2)21/SiO2]4,其制备方法为,包括以下步骤:
1)准备SiO2-Ni50Fe50溅射靶材,SiO2片子数量为2,溅射的衬底基片为Si基片,装片时的环境条件为温度:23℃,湿度:54%RH;
2)溅射时SiO2-Ni50Fe50复合靶的射频溅射功率为120W,起辉气压为0.6Pa,工作气压为0.2Pa,预溅射时间为4分钟,溅射时间为22分钟,该条件下沉积出膜厚为190nm的(Ni50Fe50)79(SiO2)21颗粒膜;
3)SiO2靶的射频溅射功率为120W,起辉气压为2.1Pa,工作气压为2Pa,预溅射时间为4分钟,溅射时间为2.1分钟,该条件下沉积出膜厚为19nm的SiO2薄膜。
4)重复上述溅射步骤4次得到[(Ni50Fe50)79(SiO2)21/SiO2]4复合膜。
5)高温退火处理的压强为4.5×10-4Pa,退火温度为220℃,保温时间为18分钟,退火时所加的磁场大小为4800Oe。
上述工艺条件下获得的[(Ni50Fe50)79(SiO2)21/SiO2]4复合膜厚度为836nm、4πMs=10000Gs、Hk=60Oe、fr=1.8GHz、μr(100MHz)=236、ρ=4500μΩ·cm、单轴各向异性方向平行膜面。
实施例3
一种高频磁芯用软磁复合膜,其化学通式为:[(Ni45Fe55)75(SiO2)25/SiO2]3,其制备方法为,包括以下步骤:
1)准备SiO2-Ni45Fe55溅射靶材,SiO2片子数量为4,溅射的衬底基片为Si基片,装片时的环境条件为温度:23℃,湿度:55%RH;
2)溅射时SiO2-Ni45Fe55复合靶的射频溅射功率为180W,起辉气压为0.5Pa,工作气压为0.18Pa,预溅射时间为3分钟,溅射时间为15分钟,该条件下沉积出膜厚为220nm的(Ni45Fe55)75(SiO2)25颗粒膜;
3)SiO2靶的射频溅射功率为150W,起辉气压为2Pa,工作气压为1.9Pa,预溅射时间为3分钟,溅射时间为2.2分钟,该条件下沉积出膜厚为22nm的SiO2薄膜;
4)重复上述溅射步骤3次得到[(Ni45Fe55)75(SiO2)25/SiO2]3复合膜;
5)高温退火处理的压强为4.5×10-4Pa,退火温度为200℃,保温时间为20分钟,退火时所加的磁场大小为5000Oe。
上述工艺条件下获得的[(Ni45Fe55)75(SiO2)25/SiO2]3复合膜厚度为726nm、4πMs=9700Gs、Hk=70Oe、fr=2.23GHz、μr(100MHz)=180、ρ=5500μΩ·cm、单轴各向异性方向平行膜面。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种高频磁芯用软磁复合膜,包括基片,其特征在于:
所述基片上沉积有3-5个薄膜单元,
所述薄膜单元由颗粒膜层和所述颗粒膜层之上的SiO2薄膜层组成;
所述颗粒膜层是由镍铁合金与SiO2复合而成,其化学组成为:(Ni100-xFex)100-y(SiO2)y,其中,x=35-60,y=15-30;
所述颗粒膜层的厚度为150-250nm,所述SiO2薄膜层的厚度为15-25nm。
2.权利要求1所述的高频磁芯用软磁复合膜的制备方法,其特征在于,包括以下步骤:
1)制备溅射用SiO2-Ni100-xFex复合靶;
2)清洗衬底基片,装入磁控溅射台;
3)沉积第一层(Ni100-xFex)100-y(SiO2)y颗粒膜;
4)沉积第二层SiO2薄膜;
5)重复3)与4)中的步骤,以制备[(Ni100-xFex)100-y(SiO2)y/SiO2]单元;
6)从磁控溅射台取出基片;
7)退火,即得。
3.根据权利要求2所述的高频磁芯用软磁复合膜的制备方法,其特征在于:
步骤3)中,沉积(Ni100-xFex)100-y(SiO2)y颗粒膜层时的射频溅射功率为100-200W,溅射时间为5-30分钟。
4.根据权利要求2所述的高频磁芯用软磁复合膜的制备方法,其特征在于,步骤4)中,沉积SiO2膜层时的射频溅射功率为100-200W,溅射时间为1-5分钟。
5.根据权利要求2所述的高频磁芯用软磁复合膜的制备方法,其特征在于,步骤7)中,在真空退火炉中加磁场退火。
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