162702 20251017144601.0 doi 10.1002/adfm.202517475 sideral 145366 ART-2025-145366 eng Sáenz-Hernández, Amaia (orcid)0009-0003-4545-3644 Cryogenic Focused Ion Beam Milling to Investigate the Anisotropic Magnetotransport Properties of Bismuth Microcrystals 2025 Access copy available to the general public Unrestricted Bulk single crystals exhibit the intrinsic properties of a given compound, but studying their anisotropic magnetotransport properties is challenging. Focused Ion Beam (FIB) milling at room temperature has been previously used to guide the electrical current path along a defined crystal direction or to extract microcrystals where the electrical current flows along a known direction. However, some materials, such as bismuth, melt under FIB irradiation. Bismuth, known for its unique properties, including very large magnetoresistance and a highly anisotropic Fermi surface, reacts to room‐temperature Ga+ FIB irradiation, forming droplets on its surface. Therefore, a novel microfabrication approach based on cryogenic FIB milling is developed here. By using a Peltier stage or an integrated cryogenic module, surface melting is mitigated below −30 °C. Microscale slabs are extracted, either parallel or perpendicular to the single crystal surface, then shaped and electrically contacted in a chip for magnetotransport characterization. The large magnetoresistance observed along with Shubnikov–de Haas oscillations with single periodicity when current is applied perpendicular to the c axis, highlights the success of the approach. These results enable FIB microfabrication of single crystals that are sensitive to FIB irradiation and investigation of the anisotropic magnetotransport properties in microcrystals. info:eu-repo/grantAgreement/ES/AEI/PID2023-146451OB-I00 info:eu-repo/grantAgreement/ES/DGA/E13-23R info:eu-repo/grantAgreement/ES/MICINN-AEI/PID2020-112914RB-I00 info:eu-repo/grantAgreement/ES/MICINN/CEX2021-001144-S-20–9 info:eu-repo/grantAgreement/ES/MICINN PRE2022-103314 info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sangiao, Soraya Universidad de Zaragoza (orcid)0000-0002-4123-487X Felser, Claudia Shekhar, Chandra Pardo, José Ángel Universidad de Zaragoza (orcid)0000-0002-0111-8284 Ibarra, Alfonso (orcid)0000-0002-4599-3013 De Teresa, José María (orcid)0000-0001-9566-0738 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. (2025), e17475 [10 pp.] Adv. funct. mater. Advanced Functional Materials 1616-301X 2449279 http://zaguan.unizar.es/record/162702/files/texto_completo.pdf Versión publicada 2995612 http://zaguan.unizar.es/record/162702/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:162702 articulos driver 2025-10-17-14:14:20 ARTICLE