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In the <jats:italic>in\u2009situ<\/jats:italic> process (ISP), green tea (GT) extract influenced the formation of particles with different sizes during the synthesis, while in the after synthesis process (ASP), it enabled the functionalization of preformed \u03b3\u2010Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> NPs. The use of GT extract significantly reduced the amount of precipitating agent\u00a0(NH<jats:sub>4<\/jats:sub>OH or NaOH) commonly used in the coprecipitation method. However, even in a polyphenol\u2010rich environment, the Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> phase is detected only a few hours after the ISP. Results from various characterization techniques revealed that altering the GT extract content\u2014<jats:italic>expressed<\/jats:italic> as percent weight\u2010to\u2010volume (x\u2009=\u2009%w\/v)\u2014affects the nanocrystallite size, magnetic behavior, and hyperfine properties, particularly in samples biosynthesized via ISP. Functionalization with GT extract enhanced the effective magnetic anisotropy of the \u03b3\u2010Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> NPs compared to bare \u03b3\u2010Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> NPs; however, this anisotropy decreased progressively as the x\u2010value increases. 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