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Nanoscale magnetic bubbles in Nd2Fe14B at room temperature

He, Y.; Helm, T.; Soldatov, I.; Schneider, S.; Pohl, D.; Srivastava, A. K.; Sharma, A. K.; Kroder, J.; Schnelle, W.; Schaefer, R.; Rellinghaus, B.; Fecher, G. H.; Parkin, S. S. P.; Felser, C.

The increasing demand for computer data storage with a higher recording density can be addressed by using smaller magnetic objects, such as bubble domains. Small bubbles predominantly require a strong saturation magnetization combined with a large magnetocrystalline anisotropy to resist self-demagnetization. These conditions are well satisfied for highly anisotropic materials. Here, we study the domain structure of thin Nd2Fe14B lamellae. Magnetic bubbles with a minimum diameter of 74 nm were observed at room temperature, approaching even the range of magnetic skyrmions. The stripe domain width and the bubble size are both thickness dependent. Furthermore, a kind of bubble was observed below the spin-reorientation transition temperature that combine bubbles with opposite helicity. In this paper, we reveal Nd2Fe14B to be a good candidate for a high-density magnetic bubble-based memory.

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Publ.-Id: 35477