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In this work we access magnetic multi-inert states of the iron(III) compound {FeL<jats:sub>2<\/jats:sub>[B(Ph)<jats:sub>4<\/jats:sub>]} \u2261 FeB at low temperature, in addition to thermal bistability. The packing of the low-spin and high-spin forms of crystalline FeB differs only marginally what ultimately leads to structural conservatism. This indicates that the SCO-immanent breathing of the complex cation is almost fully compensated by the anion matrix. The unique cooling\u00a0rate dependence of the residual low-temperature magnetisation in FeB unveils continuous switching between the trapped high-spin (ON) and the relaxed low-spin state (OFF). The macroscopic ratio of the spin states (ON:OFF) can be adjusted as a simple function of the cooling rate. That is, cooperative spin crossover can be the source of bistable and multi-inert system states in the very same material.<\/jats:p>","DOI":"10.1038\/s41467-024-51675-1","type":"journal-article","created":{"date-parts":[[2024,8,25]],"date-time":"2024-08-25T10:02:07Z","timestamp":1724580127000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Cooperative spin crossover leading to bistable and multi-inert system states in an iron(III) complex"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3852-4697","authenticated-orcid":false,"given":"Andreas","family":"D\u00fcrrmann","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3883-2879","authenticated-orcid":false,"given":"Gerald","family":"H\u00f6rner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dirk","family":"Baabe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9007-8404","authenticated-orcid":false,"given":"Frank W.","family":"Heinemann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mauricio A. 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