Magnetic damping losses of tipped cantilevers
Magnetic damping losses of tipped cantilevers
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DOI：
10.1088/0957-4484/17/3/043
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发表时间：
2006-02-14
期刊：
影响因子：
3.5
通讯作者：
Meyer, E
中科院分区：
文献类型：
--
作者：
Giorgio, M;Meier, B;Meyer, E
在磁共振力显微镜单自旋实验中，必须测量attonewton范围内的力。为了提高检测灵敏度，必须使用具有高品质因数和最小化弹簧常数的非商用软单晶硅棒杠杆。在我们的低温力显微镜中，我们在10 K下获得了10（-18）N Hz（-1/2）量级的力灵敏度（Gysin 2002 Ternperaturerverhalten der Elastizitat und inneren Reibung mikromechanischer Resonatoren，Thesis巴塞尔）.微米尺寸的磁性颗粒，其产生500 G的磁场和磁场梯度（dB/dz >> 1G nm（-1）），附着在超灵敏的悬臂梁上。力灵敏度和频率偏移的严重损失，而暴露的悬臂与磁性尖端的均匀磁场。为了最小化具有铁磁颗粒的悬臂梁的阻尼损耗，研究了具有不同晶粒和畴尺寸的各种磁性材料（例如SmCo 5、Nd 2Fe 14 B和Pr 2Fe 14 B）。最低的磁耗散观察SmCo 5和Pr 2Fe 14 B提示。我们试图解释带有磁性尖端的悬臂梁的耗散效应。
In magnetic resonance force microscopy single spin experiments, forces in the attonewton range have to be measured. Non-commercial, soft single crystalline silicon bar cantilevers with a high quality factor and minimized spring constants have to be used, in order to improve the detection sensitivity. In our low temperature force microscope we obtain force sensitivities of the order of 10(-18) N Hz(-1/2) at 10 K (Gysin 2002 Ternperaturerverhalten der Elastizitat und inneren Reibung mikromechanischer Resonatoren, Thesis Basel).Micrometre-sized magnetic particles, which generate a magnetic field of 500 G and magnetic field gradients (dB/dz >> 1 G nm(-1)), are attached on ultrasensitive cantilevers. A severe loss in force sensitivity and a frequency shift are observed while exposing a cantilever with a magnetic tip to a homogeneous magnetic field. To minimize the damping losses of the cantilevers with ferromagnetic particles, various magnetic materials (e.g. SmCo5, Nd2Fe14B, and Pr2Fe14B) with different grain and domain sizes are investigated. The lowest magnetic dissipation is observed with SmCo5 and Pr2Fe14B tips. We try to explain the dissipation effect of cantilevers with magnetic tips.