摘要:
A magnetic read head has a current perpendicular to the planes (CPP) sensor with a top cap layer that is ruthenium (Ru) or rhodium (Rh) or a top cap layer structure which includes a first layer of tantulum (Ta) only, a second layer of ruthenium (Ru), rhodium (Rh) or gold (Au) with the first layer being located between a spacer layer and the second layer.
摘要:
The first and second side surfaces of either a bottom spin valve sensor or a top spin valve sensor are notched so as to enable a reduction in the magnetoresistive coefficient of side portions of the sensor beyond the track width region thereby minimizing side reading by the sensor. The first and second notches of the spin valve sensor are then filled with layers in various embodiments of the invention to complete the spin valve sensor.
摘要:
A spin valve sensor is provided with a negative ferromagnetic coupling field −HFC for properly biasing a free layer and a spin filter layer is employed between the free layer and a capping layer for increasing the magnetoresistive coefficient dr/R of the spin valve sensor. A top portion of the free layer is oxidized for improving the negative ferromagnetic coupling field −HFC when the spin filter layer is employed for increasing the magnetoresistive coefficient dr/R.
摘要:
A free layer for a spin valve sensor includes a cobalt iron (CoFe) film which has an easy axis oriented perpendicular to an air bearing surface (ABS) of a read head and a nickel iron (NiFe) film which has an easy axis oriented parallel to the ABS and parallel to the major planes of the thin film layers. In a further embodiment the free layer is annealed at a high temperature in the presence of a field which is oriented perpendicular to the ABS.
摘要:
An apparatus is described having a portion of a magnetoresistive structure wherein the portion of the magnetoresistive structure includes an oxide seed layer formed upon a substrate; and, a free layer formed upon the oxide seed layer. The free layer comprises a magnetic barrier layer formed over the oxide seed layer. The free layer comprises a magnetic layer formed over the magnetic barrier layer. The magnetic barrier layer has a thickness that prevents reaction between the magnetic layer and the oxide seed layer.
摘要:
A free layer structure is provided with a first layer of cobalt iron boron (CoFeB) for improving soft magnetic properties of the free layer structure in a top spin valve sensor by decreased uniaxial anisotropy HK, easy axis coercivity HC and hard axis coercivity HCK of the free layer structure. The free layer structure also includes a second layer of nickel iron based material and a third layer of cobalt based material disposed adjacent a nonmagnetic conductive spacer layer of a spin valve sensor.
摘要:
A seed layer is provided for a pinning layer which increases the pinning field HPIN between a pinning layer and a pinned layer of a spin valve sensor. In an example the seed layer structure included a first seed layer of cobalt iron boron (CoFeB), a second seed layer of nickel manganese oxide (NiMnO) and a third seed layer of aluminum oxide (Al2O3) with the first seed layer interfacing the pinning layer and the second seed layer being located between the first and third seed layers. A pinning field between the pinning and pinned layers was 600 Oe and the magnetoresistive coefficient of the spin valve sensor was 8.8%. The pinned layer can be a single pinned layer or an antiparallel (AP) pinned layer structure. If the pinned layer structure is a single pinned layer the cobalt iron boron (CoFeB) first seed layer provides a second significant function of at least partially counterbalancing the demagnetizing field from the pinned layer.
摘要翻译:为钉扎层提供种子层,其增加钉扎层和自旋阀传感器的钉扎层之间的钉扎场HPIN。 在一个实例中,种子层结构包括钴铁硼(CoFeB)的第一晶种层,镍锰氧化物(NiMnO)的第二晶种层和氧化铝(Al 2 O 3)的第三籽晶层,第一籽晶层与钉扎 层,第二种子层位于第一和第三种子层之间。 钉扎和钉扎层之间的钉扎场为600Oe,自旋阀传感器的磁阻系数为8.8%。 被钉扎层可以是单个钉扎层或反平行(AP)钉扎层结构。 如果被钉扎层结构是单个钉扎层,则钴铁硼(CoFeB)第一籽晶层提供了至少部分平衡去磁场与被钉扎层的第二显着功能。
摘要:
A method constructs first and second seed layers of a seed layer structure in-situ for a top spin valve sensor for increasing magnetoresistive coefficient dr/R of the sensor, reducing a ferromagnetic coupling field HFC between pinned and free layers of the sensor and reducing coercivity HC of the free layer. The first layer, which is aluminum oxide (Al2O3), is ion beam sputter deposited on a first shield layer in a sputtering chamber under a specified pressure. The second seed layer, which is nickel oxide based, is deposited on the first seed layer by ion beam sputter deposition without breaking the vacuum of the chamber. The free layer is then directly deposited on the second seed layer followed by formation of the remainder of the layers of the spin valve sensor. In one embodiment of the invention a read gap layer and the first seed layer are located between a first shield layer and the second seed layer while in the second embodiment of the invention the first seed layer is the only layer between the first shield layer and the second seed layer.
摘要:
First and second antiparallel (AP) pinned layers of an AP pinned layer structure are cobalt iron (CoFe) which increases the GMR (magnetoresistive coefficient dr/R) of a spin valve sensor by 10% with improved magnetic stability over a spin valve sensor where the first and second AP pinned layers are cobalt (Co).
摘要:
A high magnetization, high resistivity, low corrosion and near zero magnetostriction soft adjacent layer (SAL) is provided for a magnetoresistive (MR) sensor of a read head. The MR sensor may either be an anisotropic MR (AMR) sensor or a spin valve sensor. In both sensors the SAL is CoHfNb or CoHfNbFe. The Hf is added to reduce corrosion and the Hf and Nb are balanced to provide near zero magnetostriction. The addition of Fe is an enhancer for reducing negative magnetostriction without diluting the magnetism of the alloy. Since CoHfNb has significantly higher magnetization than NiFeCr the SAL layer of CoHfNb can be thinner than the SAL of NiFeCr which results in a significantly higher resistance SAL. The higher resistance SAL equates to less shunting of the sense current through the SAL and better signal performance of the MR read head.