1. A magnetic head assembly comprising
a magnetic recording unit that includes:
a recording magnetic pole;
a spin torque oscillator that has first and second magnetic layers, and an intermediate layer interposed between the first and second magnetic layers, the spin torque oscillator generating a high-frequency magnetic field by applying a current between the first and second magnetic layers; and
a third magnetic layer that is placed adjacent to at least part of a side face of the second magnetic layer.
2. The head assembly according to claim 1, wherein an insulating layer is provided between the third magnetic layer and the spin torque oscillator.
3. The head assembly according to claim 1, wherein coercive force of the first magnetic layer and the third magnetic layer is smaller than a magnetic field generated from the recording magnetic pole toward the first magnetic layer and the third magnetic layer.
4. The head assembly according to claim 1, wherein the third magnetic layer has magnetic anisotropy in the same direction as the first magnetic layer.
5. The head assembly according to claim 1, wherein the third magnetic layer is made of a material having higher saturation flux density than the second magnetic layer.
6. A magnetic head assembly comprising:
a recording magnetic pole;
a spin torque oscillator that has first and second magnetic layers, and an intermediate layer interposed between the first and second magnetic layers, the spin torque oscillator generating a high-frequency magnetic field by applying a current between the first and second magnetic layers; and
a magnetic shield that is provided to face surfaces of the recording magnetic pole and the second magnetic layer, the surfaces existing in a track movement direction, a distance between the magnetic shield and the second magnetic layer being shorter than a distance between the recording magnetic pole and the magnetic shield.
7. The head assembly according to claim 6, wherein coercive force of the first magnetic layer is smaller than a magnetic field generated from the recording magnetic pole toward the first magnetic layer.
8. The head assembly according to claim 6, wherein the second magnetic layer is located on the opposite side of the first magnetic layer from the recording magnetic pole.
9. The head assembly according to claim 6, wherein the first magnetic layer is located on the opposite side of the second magnetic layer from the recording magnetic pole.
10. The head assembly according to claim 6, wherein one of two electrodes that supply current to the spin torque oscillator is the recording magnetic pole.
11. A magnetic recordingreproducing apparatus comprising:
a magnetic recording medium;
the magnetic head assembly according to claim 1;
a movement control unit that controls the magnetic recording medium and the magnetic head assembly to have relative movements in a floating or contact state, the magnetic recording medium and the magnetic head assembly facing each other;
a position control unit that controls the magnetic head assembly to be located in a predetermined recording position of the magnetic recording medium; and
a signal processing unit that performs processing on a signal for writing on the magnetic recording medium and a signal for reading from the magnetic recording medium, with the use of the magnetic head assembly.
12. The apparatus according to claim 11, wherein the magnetic recording medium has a structure formed with two stacked magnetic layers having different magnetic anisotropy levels from each other.
13. The apparatus according to claim 12, wherein magnetic anisotropy of a magnetic layer of the magnetic recording medium closer to the magnetic head assembly is smaller than magnetic anisotropy of a magnetic layer of the magnetic recording medium farther away from the magnetic head assembly.
14. The apparatus according to claim 11, wherein the magnetic recording medium is a discrete track medium that has a nonmagnetic material interposed between each two adjacent recording tracks.
15. The apparatus according to claim 11, wherein the magnetic recording medium is a discrete bit medium that has recording magnetic pattern portions regularly arranged, the recording magnetic pattern portions being isolated from one another by nonmagnetic portions.
16. The apparatus according to claim 15, wherein the magnetic head assembly performs recording, with each two recording magnetic pattern portions adjacent to each other in a track width direction being a unit of recording information.
17. The apparatus according to any one of claim 11, wherein the spin torque oscillator is placed on a trailing side of a movement direction of the magnetic recording medium.
18. The apparatus according to claim 11, wherein the spin torque oscillator is placed on a leading side of a movement direction of the magnetic recording medium.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. On a computing system, a method of adapting an identification andor scheduling of video items for recording based on usage, the method comprising:
detecting a trigger to perform a series update, the series update comprising an update of a trend group series in which trend group activity of a weighted threshold plurality of members of a trend group regarding a selected video item triggers an automatic scheduling of the selected video item for recording by other members of the trend group, the trigger comprising an exceeding of a threshold ratio, the threshold ratio comprising a quotient of a sum of weighted user count values for members of the trend group that manually scheduled the selected video item for recording before the weighted threshold plurality of members was reached and a total sum of all weighted user count values of the trend group;
upon detection of the trigger, determining one or more video items to record for the trend group series by providing input of weighted user count values to a series update module that returns candidate video items for inclusion in the series, the candidate video items being determined based upon the threshold plurality of members of the trend group having manually scheduled the candidate video items for recording;
automatically scheduling zero or more of the candidate video items for recording;
tracking feedback related to video item playback of one or more video items that were recorded based upon the scheduling; and
based upon the feedback, adapting the input provided to the series update module for a later series update by modifying a weighting factor of the weighted user count value for a trend group member that manually scheduled the selected video item for recording before the weighted threshold number of members was reached.
2. The method of claim 1, wherein modifying the weighting factor for the trend group member comprises modifying the weighting factor for each trend group member that manually scheduled the selected video item for recording before the weighted threshold number of members was reached.
3. The method of claim 1, wherein the input comprises a priority value assigned based upon a comparison between a number of viewers that watch a particular video item and a number of viewers that recorded the particular video item, and wherein adapting the input comprises modifying the priority value based upon the comparison.
4. The method of claim 1, wherein the feedback comprises one or more of information regarding whether recorded video items are played, information regarding whether video items played receive positive andor negative user feedback, and information regarding an amount of usage of the series update module.
5. The method of claim 4, further comprising assigning a reputation score to one or more of the series and the series update module based upon the feedback.
6. The method of claim 5, further comprising determining a personal reputation factor based upon a correlation of playback statistics of a user with playback statistics of one or more other users.
7. The method of claim 1, wherein the computing system comprises a client digital video recording device.
8. The method of claim 1, wherein the computing system comprises a remote digital video recording service.
9. A computing system comprising:
a processor; and
a storage device comprising instructions executable by the processor to adapt an identification andor scheduling of video items for recording based on usage by
detecting a trigger to perform a series update, the series update comprising an update of a trend group series in which trend group activity of a weighted threshold plurality of members of a trend group regarding a selected video item triggers an automatic scheduling of the selected video item for recording by other members of the trend group, the trigger comprising an exceeding of a threshold ratio, the threshold ratio comprising a quotient of a sum of weighted user count values for members of the trend group that manually scheduled the selected video item for recording before the weighted threshold plurality of members was reached and a total sum of all weighted user count values of the trend group;
upon detection of the trigger, determining one or more video items to record for the trend group series by providing input of weighted user count values to a series update module that returns candidate video items for inclusion in the series, the candidate video items being determined based upon the threshold plurality of members of the trend group having manually scheduled the candidate video items for recording;
automatically scheduling zero or more of the candidate video items for recording;
tracking feedback related to video item playback of one or more video items that were recorded based upon the scheduling; and
based upon the feedback, adapting the input provided to the series update module for a later series update by modifying a weighting factor of the weighted user count value for a trend group member that manually scheduled the selected video item for recording before the weighted threshold number of members was reached.
10. The computing system of claim 9, wherein modifying the weighting factor for the trend group member comprises modifying the weighting factor for each trend group member that manually scheduled the selected video item for recording before the weighted threshold number of members was reached.
11. The computing system of claim 9, wherein the input comprises a priority value assigned based upon a comparison between a number of viewers that watch a particular video item and a number of viewers that recorded the particular video item, and wherein adapting the input comprises modifying the priority value based upon the comparison.
12. The computing system of claim 9, wherein the feedback comprises one or more of information regarding whether recorded video items are played, information regarding whether video items played receive positive andor negative user feedback, and information regarding an amount of usage of the series update module.
13. The computing system of claim 12, further comprising assigning a reputation score to one or more of the series and the series update module based upon the feedback.
14. The computing system of claim 13, further comprising determining a personal reputation factor based upon a correlation of playback statistics of a user with playback statistics of one or more other users.
15. The computing system of claim 9, wherein the computing system comprises a client digital video recording device.
16. The computing system of claim 9, wherein the computing system comprises a remote digital video recording service.