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Single core-shell nanoparticle probes for non-invasive magnetic force microscopy

机译：用于无创磁力显微镜的单核壳纳米粒子探针

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摘要

We present an easy, fast and reliable method for the preparation of magnetic force microscopy (MFM) probes based on single Co nanoparticles (NPs). Due to their dipolar character, these magnetic probes open up a new approach for quantitative and non-invasive MFM measurements on the nanometer length scale. To guarantee long-term stability of these tips under ambient conditions, an ultrathin protecting Au shell was grown around the Co NPs through photochemical deposition. Single magnetic particles were firmly attached to standard silicon AFM tips using bifunctional self-assembling molecules. Such probes were tested on longitudinal magnetic recording media and compared to the results as recorded with conventional thinfilm MFM tips. Easy data interpretation of the magnetic nanoparticle probes in a point dipole model is shown. Our nanoparticle tips provide excellent endurance for MFM recording, enable noninvasive probing while maintaining a high sensitivity, resolution, and reproducibility.
机译：我们提出了一种基于单个Co纳米粒子（NP）的磁力显微镜（MFM）探针的制备简便，快速和可靠的方法。由于它们的偶极特性，这些磁探针为纳米级长度的定量和非侵入性MFM测量开辟了一种新方法。为了保证这些笔尖在环境条件下的长期稳定性，通过光化学沉积在Co NPs周围生长了一层超薄保护金壳。使用双功能自组装分子将单个磁性颗粒牢固地附着到标准的硅AFM尖端上。此类探针在纵向磁记录介质上进行了测试，并与常规薄膜MFM尖端记录的结果进行了比较。显示了点偶极子模型中磁性纳米粒子探针的简单数据解释。我们的纳米颗粒针尖可为MFM记录提供出色的耐用性，可进行无创探测，同时保持高灵敏度，分辨率和可重复性。

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