The　state　of　the　microstructures　determines　both　the　mechanical　properties　(hardness,　yield　strength,　elongation,　etc.)　and　micro-magnetic　properties　(magnetic　Barkhausen　noise　(MBN),　incremental　permeability　(IP),　etc.).　The　non-destructive　nature　of　the　micro-magnetic　testing　technology　facilitate　it　be　a　valuable　tool　for　quality　control　in　the　manufacturing　of　ferromagnetic　components.　In　the　implementation　of　micro-magnetic　testing,　the　functions　and　the　geometry　of　the　sensors　need　be　customized　for　specific　target　properties　and　components.　In　this　paper,　four　types　of　advanced　or　multifunctional　sensors　are　presented　and　applied　for　micro-magnetic　testing.　First,　a　multifunctional　sensor　is　developed　for　flat　surface.　Unique　intermittent　magnetizing　method　using　superimposed　magnetic　fields　of　high　and　low　frequencies　enable　the　sensor　to　measure　the　magnetic　Barkhausen　noise,　incremental　permeability,　eddy　currents,　tangential　magnetic　field　and　main　flux.　Second,　to　conduct　magnetic　Barkhausen　noise　testing　at　the　inner　corner　of　V-shape　bending　plate,　a　miniaturized　sensor　with　U-shape　roller　magnetizer　is　designed　to　perfect　contact　with　the　corner　region.　Third,　read　head　of　a　magnetic　tape　player　is　revised　to　act　as　high-lateral-resolution　(up　to　500μm)　sensor　for　magnetic　Barkhausen　noise　measurement　in　ferromagnetic　film.　Fourth,　a　slender　probe　is　developed　and　embedded　into　an　anti-bulking　fixture　that　is　clamped　onto　the　flat　specimen.　With　the　slender　probe　together　with　the　special　fixture,　the　dependency　of　the　magnetic　Barkhausen　noise　on　the　compressive　and　tensile　stress　is　first　experimentally　observed　in　a　single　flat　specimen　under　continuous　load.