Shaandhooyinka birlabku waxay ka kooban yihiin walxo birlab ah oo xooggan iyo shaashad shaandhaysa xannibaad ah. Waxay leeyihiin toban jeer xoogga xabagta ee agabka birlabeedka guud waxayna awood u leeyihiin inay ku dhejiyaan wasakhaha ferromagnetic cabbirka mikrometerka ee saamaynta dareeraha degdega ah ama heerka socodka heerka sare. Marka wasakhda ferromagnetic ee dhexdhexaadka haydarooliga ay dhex maraan farqiga u dhexeeya siddooyinka birta, waxaa lagu dhejiyaa siddooyinka birta, si ay u gaaraan saamaynta shaandhaynta.